Photon Energy Range Research Articles

Design of a Multi-Monochromatic X-ray Imager (MMI) for Kr K-shell line emission.

The Multi-Monochromatic X-ray Imager (MMI) is a time-gated spectrometer used in implosion experiments at the OMEGA laser facility. From the data, electron temperature and density spatial distributions can be obtained at different implosion times. Previous MMI designs used Ar K-shell emission (3-6keV) as a spectroscopic tracer and provided a spectral resolution of around 20eV. However, Ar K-shell line emission becomes less useful at electron temperatures above 2keV due to over-ionization. Kr K-shell (12-16keV) has been shown to be an attractive alternative to diagnose hot implosion cores in recent publications. The purpose of this paper is to show a new point design that allows the MMI to detect this higher photon energy range with suitable spectral resolution. The algorithm used to find the optimal design couples a ray-tracing code and an exhaustive parameter space search. This algorithm may be useful as a tool to find optimal MMI designs for other purposes, i.e., other spectral regions for other spectroscopic tracers. The main change between the two designs is the replacement of the multi-layer mirror with a flat Bragg Ge (220) crystal. The final Kr K-shell MMI design has a photon energy range from 12 to 16.1keV.

A newly designed femtosecond KBe2BO3F2 device with pulse duration down to 55fs for time- and angle-resolved photoemission spectroscopy.

Developing a widely tunable vacuum ultraviolet (VUV) source with a sub-100fs pulse duration is critical for ultrafast pump-probe techniques such as time- and angle-resolved photoemission spectroscopy (TrARPES). While a tunable probe source with a photon energy of 5.3-7.0eV has been recently implemented for TrARPES by using a KBe2BO3F2 (KBBF) device, the time resolution of 280-320fs is still not ideal, which is mainly limited by the duration of the VUV probe pulse generated by the KBBF device. Here, by designing a new KBBF device, which is specially optimized for fs applications, an optimum pulse duration of 55fs is obtained after systematic diagnostics and optimization. More importantly, a high time resolution of 81-95fs is achieved for TrARPES measurements covering the probe photon energy range of 5.3-7.0eV, making it particularly useful for investigating the ultrafast dynamics of quantum materials. Our work extends the application of the KBBF device to ultrafast pump-probe techniques with the advantages of both a widely tunable VUV source and ultimate time resolution.

Radiation shielding studies of low melting point MCP alloys in the photon energy range of 10 keV–10 MeV

Photon attenuation properties of low melting-point MCP alloys of 5 N Plus Company are evaluated for 10 keV–10 MeV using MCNPX code, XCOM and XMuDat programs, Auto-Zeff software and linear interpolation method. The simulated and calculated results were in good agreement with differences of < ± 2 %. MCP-124 had the highest shielding efficiency compared to other alloys. It was found that, the µm and σa values of studied alloys decreased with photon energy. MCP-200 had the highest values of 2.7 HVL at the 6 MeV photon energy. The σa values of MCP alloys increased as follow at the photon energies above 0.1 MeV: MCP-69 < MCP-200 < MCP-137 < MCP-96 < MCP-124. In addition, the Zeff values averaged on studied photon energy range were 30.86, 47.74, 68.14, 76.63 and 82.55 respectively for MCP-69, MCP-200, MCP-137, MCP-96 and MCP-124 alloys. The Neff values of alloys varied in the range of 1.63 × 1023 – 3.03 × 1023 electron/g.

Rayleigh scattering from hydrogen atoms including resonances and high photon energies

The nonrelativistic cross section from Rayleigh scattering by hydrogen atoms in the ground state was calculated over a wide range of photon energies (&lt;0.8 keV). Evaluations were performed in terms of the real and imaginary components of the atomic polarizability. The sum over intermediate states that characterizes this second-order radiative process was performed using exact analytic expressions for oscillator strengths of bound and continuum states. Damping terms associated with the finite lifetimes of excited states and their splitting into two fine-structure levels (p1/2 and p3/2) are taken into account in resonance cross sections. Fitting formulas required for cross-section evaluation are presented for incident photon energy (i) redward of the first resonance (Lyman-α1/2), (ii) in the spectral region corresponding to resonances (for an arbitrary number of them), and (iii) above the ionization threshold.

Radiation Shielding Enhancement of Polyester Adding Artificial Marble Materials and WO3 Nanoparticles

The radiation shielding abilities of waste marbles with different concentrations of WO3 (tungsten oxide) nanoparticles were investigated. Four marbles were prepared with 0, 0.05, 0.1, and 0.2 WO3 nanoparticles. The study aims to investigate the effect of the WO3 concentration, the density, and the particle size of the waste marble samples. The linear attenuation coefficient (LAC) of the S1 sample, the sample with no WO3, was determined theoretically and experimentally, and the results demonstrated that they were close enough together to adequately determine the LAC of the other samples. Additionally, the samples with nano-WO3, rather than micro-WO3, were found to have a greater LAC, showing that decreasing the particle size of the sample improves their shielding ability. Samples with greater WO3 content also had higher LAC values. The LAC of the marbles was also evaluated at a wide energy range (0.015–15 MeV) to examine the shielding properties of the samples for a wide range of applications, and an inverse trend between LAC and energy was observed. The radiation protection efficiency (RPE) of the marbles demonstrated that the marbles absorb almost all incoming photons at low energies. As energy increases, the efficiency of the samples naturally drops, as the photons are able to penetrate through them with greater ease. High energy dependence was found when calculating the half-value layers (HVL) of the samples. When comparing the LAC and mean free paths (MFP) of the marbles, an inverse relationship was observed. Furthermore, the samples with nano-WO3 had a smaller MFP than those with micro-WO3, meaning that decreasing the particle size of the samples improves their radiation shielding ability. The Zeff of the micro-WO3 samples was also determined and the values followed three distinctive trends depending on the energy range of the incoming photons.

Experimental and theoretical investigation on physical, structure and protection features of TeO2–B2O3 glass doped with PbO in terms of gamma, neutron, proton and alpha particles

Glass series of composition 70TeO2- (30-x)B2O3- xPbO (where x = 2, 6, 10, 14 and 20 mol%) is prepared using melt-quenching technique. The glass structure was investigated by X-ray diffraction (XRD). Manufactured glass density, molar volume and Fourier transform infrared spectroscopy (FTIR) were measured. Shielding parameters against gamma-rays including, linear attenuation coefficient (μ), mass attenuation coefficients (μm), half-value layer (HVL) and mean free path (λ) were measured experimentally at energies of 0.664, 1.177 and 1.334 MeV using Cs137 and Co60 point sources and NaI(TL) scintillation detector. The measured parameters were compared with those calculated using XCOM program with a good agreement between them. To fully comprehend the shielding efficiency of the prepared glasses, several shielding parameters including, μm, HVL, effective atomic number (Zeff), electron density (Nel), equivalent atomic number (Zeq), exposure and energy absorption buildup factors (EBF & EABF), radiation protection efficiency (RPE) and kerma relative to air (Ka), were evaluated in the photon energy range 0.015–15 MeV and compared with some materials that commonly used as gamma-ray shielding. The findings demonstrate the viability of employing the current glass composition as an effective agent for gamma-ray shielding and fully protection (100%) for x-ray. The macroscopic effective removal cross section (ΣR) of the prepared glasses were calculated and compared with those of frequently used neutron shielding materials. Finally, the mass stopping power (MSP) and projected range (PR) values of proton (H1) and alpha particles (He+2) have been evaluated in the energy range 0.01–15 MeV. The results show that, increasing PbO content improves shielding characteristics. Among the examined samples, the S5 glass sample was found to be superior in terms of photon, neutron, proton and alpha particles protection. These results indicate that, the prepared glass samples are highly appropriate nuclear shielding material that can be used in many applications.

First-principles study of optoelectronic and thermoelectronic properties of the ScAgC half-Heusler compound

In this paper, we have presented a theoretical study in the context of photovoltaic (PV) and thermoelectric (TE) applications of ScAgC. The electronic, optical, and thermoelectric properties have been investigated systematically using DFT and semi-classical Boltzmann transport theory. DFT calculates a direct band-gap of ∼0.47 eV, whereas the G 0 W 0 method estimates a band-gap of ∼1.01 eV. We used parabola fitting to estimate the effective mass (m *) values for bands B1-B4 at Γ-point, which are ∼−0.087 (−0.075), ∼−0.17 (−0.27), ∼−0.17 (−0.27), and ∼0.049 (0.058) along the Γ-X (Γ-L) direction, respectively. We have investigated phonon dispersion and thermal properties. Furthermore, the properties of optoelectronics are calculated and analysed over a range of photon energies from 0 to 10 eV. The optical conductivity σ(ω), refractive index , and dielectric function ϵ(ω) show strong optical transitions in the visible region. The lowest calculated value of reflectivity r(ω) is ∼0.24 at ∼4.7 eV, and the highest calculated value of absorption coefficient α(ω) is ∼1.7 × 106 cm−1 at ∼8.5 eV. At 300 K, we have expected a maximum solar efficiency (SLME) of ∼33% at ∼1 μm of thickness. The lattice part of thermal conductivity κ ph shows a maximum value of ∼3.8 Wm −1 K −1 at 1200 K. At 1200 K, for electron doping of ∼3.9 × 1021cm−3, the maximum value of S 2 σ/τ is ∼145 × 1014 μ WK−2 cm−1 s−1, while for hole doping of ∼1.5 × 1021cm−3, it is ∼123 × 1014 μ WK−2 cm−1 s−1. The highest ZT at 1200 K is expected to be ∼0.53, whereas the optimal %efficiency is predicted to be ∼8.5% for cold and hot temperatures of 300 K and 1200 K, respectively. The collected results suggest that the ScAgC compound would be a potential candidate for renewable energy sources such as solar cell and TE applications.

Understanding the physical, optical and gamma ray shielding properties of the PbO-Bi2O3-CdO-B2O3 glass systems

Physical properties, optical properties, and shielding properties were reported herein by varying the amount of bismuth (III) oxide (Bi2O3) and boron oxide (B2O3) on the PbO-Bi2O3-CdO- B2O3 glass systems through Melt quenching technique. After altering the amount of Bi2O3 density studied glass systems have varied from 4.3 g/cm3 - 5.7 g/cm3. With the addition of bismuth oxide, the density, molar volume, and oxygen packing density all rise. As bismuth concentration increases, the indirect band gap reduces, indicating structural changes in the glasses. As bismuth concentration rises, so do the refractive index (n), optical dielectric constant, and reflection loss (RL) characteristics. Ionic nature of current samples is supported by the reduction in electronegativity and rise in polarizability, which reduces the band gap. Linear attenuation coefficients (LAC), mass attenuation coefficients (MAC), half value layers (HVL), and mean free path (MFP) were calculated for photon energy range 0.015–15 MeV via exploiting Phy-X software. Containing supreme amount of Bi2O3 (25% mol) studied glass systems have shown higher values of effective atomic number (Zeff), LAC, MAC along with least values of HVL and MFP considering with other studied glass systems. Results showed that deposition of Bi2O3 on the studied glass systems has boosted their shielding ability.

First-principles investigation of structural, electronic and optical properties of cubic K2CsSb with different surface orientations

The bi-alkali antimonide photocathodes have been widely applied in the fields of fast-speed photodetection and high-energy physics. To guide the preparation of high-sensitive K2CsSb photocathode, by first-principles calculations based on density functional theory, the electronic and optical properties of cubic K2CsSb surface models with different surface orientations and atomic terminations are investigated. More specifically, the properties including surface geometry structures, electronic structure, optical properties, work function and surface energies of the (100) K-terminated, (100) Cs Sb-terminated, (111) Cs-terminated and (111) K-terminated and (110) surfaces are analyzed to determine the surface with superior photoemission performance. It is found that the (111) Cs-terminated surface exhibits the highest conductivity and the lowest work function, indicating its best emission ability, meanwhile, the lowest surface energy and Gibss free energy show its best structural stability and thermodynamic stability. Moreover, the (111) Cs-terminated surface with the advisable optical properties in the photon energy range of 3.1–3.2 eV, is conducive to the improvement of quantum efficiency, which makes it favorable for radiation detection from scintillators.

L -shell photoionization of Mg-like S4+ in ground and metastable states: Experiment and theory

We report measurements of the absolute photoionization cross sections of magnesiumlike ${\mathrm{S}}^{4+}$ over the 158--280 eV photon energy range. The experiments were performed with the multianalysis ion apparatus at the SOLEIL synchrotron radiation facility. Single- and double-ionization ion yields produced by the photoionization of the $2p$ subshell of the ${\mathrm{S}}^{4+}$ both from the $2{p}^{6}3{s}^{2}{\phantom{\rule{0.16em}{0ex}}}^{1}{S}_{0}$ ground state and the $2{p}^{5}3s3p{\phantom{\rule{0.16em}{0ex}}}^{3}{P}_{0,1,2}$ metastable levels were observed, as well as $2s$ excitations. Theoretical calculations of the photoionization cross sections were carried out using multiconfiguration Dirac-Fock and $R$-matrix computer codes and the results are compared with the experimental data. While in general reasonably good agreement was found, notable differences in the strengths and positions of predicted resonances were observed and significant systematic energy shifts of the theoretical predictions were required.

Enhancing the physical, optical and shielding properties for ternary Sb2O3–B2O3–K2O glasses

Ternary Sb2O3–B2O3–K2O glass system, with general composition of x Sb2O3–(70-x) B2O3–30 K2O (where x = 0, 10, 20, 30, 40, 50) were prepared using melt-quenching technique. Structures of these glasses were investigated using XRD analysis and FT-IR spectroscopy. The optical properties were investigated using the UV–Vis NIR JASCO (Model V-670) Double Beam Spectrophotometer. Different physical parameters, such as density (ρ), molar volume (VM), oxygen molar volume (VO) and oxygen packing density values (OPD) have been estimated. Also, the Gamma radiation shielding ability have been characterized for the investigated glasses using Phy-X/PSD software in the photon energy range (0.015–15 MeV). XRD analysis confirm the amorphous nature of the prepared glasses. The optical energy gap of SBK glasses is decreasing from 4 to 2.63 eV with increasing Sb2O3 content while refractive index is increasing from 2.17 to 2.5 because of increasing the non-bridging oxygens (NBOs) in the glass matrix. The molar refractivity (Rm), molar polarizability (αm) and the third-order nonlinear optical susceptibility values χ3 have been calculated, their values are found to increase with increasing Sb2O3 content. Glass density and molar volume values for the SBK glasses increase with increasing Sb2O3 content. Increasing the Sb2O3 concentration enhance the radiation shielding features of the prepared glasses against gamma rays and neutrons. Hence, the mass attenuation coefficient (MAC) increases from 8.6 to 35.4 cm2/gm while the half value layer (HVL) decreases from 0.036 to 0.0046 cm at 0.015 MeV as the Sb2O3 concentration increases from 0 to 50 mol%. The fast neutron cross section of the six investigated SBK glasses are (0.087, 0.092, 0.095, 0.091, 0.094 and 0.092 cm−1), respectively.

Neutron irradiation effect on amorphous porous silica

AbstractPorous silica is widely used as antireflection films in inertial confinement fusion facilities and be irradiated by high fluence neutron. To date, the neutron irradiation effect of amorphous porous silica is still unclear. In this paper, we give a comprehensive insight into neutron irradiation effect on microstructure, mechanical, and optical properties of porous silica under 14 MeV neutron irradiation by using molecular dynamics and density‐functional theory‐based methods. We find that, for microstructure, neutron irradiation elongates Si–O bond distance, obviously reduces the max value of Si–O–Si bond angle, coordination number distribution, and increases Si3+ and non‐bridging oxygen defects. The bulk modulus, shear modulus, and Young's modulus are all obviously reduced due to neutron irradiation, but Poisson's ratio changes relatively small. The light transmittance is reduced, and the optical absorption coefficient is increased after neutron irradiation, especially in the photon energy range of 3–4 eV, which is detrimental to the resistance of laser‐induced damage. Moreover, we find that neutron irradiation has more influence on high‐porosity porous silica than low‐porosity porous silica, which is mainly due to the higher defect percentage in high porosity. Present work is expected to be valuable in the study of degradation mechanism of nuclear material under neutron radiation.

Extremely brilliant crystal-based light sources

Brilliance of novel gamma-ray Crystal-based Light Sources (CLS) that can be constructed through exposure of oriented crystals to beams of ultra-relativistic charged particles is calculated basing on the atomistic scale numerical modeling of the channeling process. In an exemplary case study, the brilliance of radiation emitted in a diamond-based Crystalline Undulator LS by a 10 GeV positron beam available at present at the SLAC facility is computed. Intesity of CU radiation in the photon energy range 10^0 - 10^1 MeV, which is inaccessible to conventional synchrotrons, undulators and XFELs, greatly exceeds that of laser-Compton scattering LSs and can be higher than predicted in the Gamma Factory proposal to CERN. Construction of novel CLSs is a challenging task which constitutes a highly interdisciplinary field entangling a broad range of correlated activities. CLSs provide a low-cost altenative to conventional LSs and have enomorous number of applications.

Four-phases characterization of synthesised CeO2 thin films: Effect of molarity on structural, optical, physical properties and gamma-ray attenuation parameters

A group of novel CeO 2 thin films were synthesised using ultrasonic spray pyrolysis process. The composition ratios of these films were modified to investigate changes in their optical, surface, electrical, and structural characteristics. Absorbance spectra in the range 300–900 nm was acquired. Transmittance in the visible area was determined to be 50%. The optical band gap was reported to vary between 3.38 and 3.52eV using absorbance spectra. X-ray diffraction was used to analyse the films' structure, while atomic force microscopy was used to determine the surface roughness values. Spectroscopic ellipsometry and the Cauchy–Urbach model were used to calculate the thicknesses. Electrical resistivity values were determined using a four-probe system. CeO 2 thin film X-ray diffraction patterns validated the polycrystalline cubic fluorite structure. According to the data, the deposited films expand preferentially in the (2 0 0) direction. The films were found to have a high resistivity of 10 6 Ω cm. We also evaluated the nuclear radiation shielding properties of CeO 2 thin films in the 0.015–15 MeV photon energy range. The results indicated that CeO 2 thin film exhibits promising half value layers of 0.00169 cm, 0.14055 cm, 1.62665 cm, and 2.30273 cm, respectively, for 0.015 MeV, 0.15 MeV, 1 MeV, and 15 MeV CeO 2 films have been determined to be worth working on and may be promising materials for optoelectronic and nuclear security applications.

Construction of Cryogen-Free 4.3T Superconducting Wiggler for NSLS-II Ring

With the 3 GeV electron beam energy for the National Synchro-tron Light Source II (NSLS-II) ring, only superconducting wig-glers (SCW) producing greater than 4T peak field can cover the photon energy range of 20keV and 200keV with sufficient num-ber of photons. The High energy Engineering X-ray (HEX) Dif-fraction beamline, which is primarily funded by the New York State Energy Research and Development Authority (NYSERDA) and NSLS-II, will be equipped with a 1.2m-long SCW with 70mm period length and 4.3T on-axis field. This SCW is free from the use of liquid Helium and is cooled only with cryo-coolers. The Electron Beam Chamber (EBC) with vertical aper-ture of 8mm is made from 316LN stainless steel and copper plat-ing is applied both entire upper surface and +- 12.5mm wide from the center in the inner surface. The expected heat load from the electron beam of the NSLS-II ring is estimated to be 10W/m. This paper describes the design principles and engineering chal-lenges for the device.

Detailed investigation on x-ray emission from laser-driven high-Z foils in a wide intensity range: Role of conversion layer and re-emission zone

Detailed radiation hydrodynamic simulations are carried out to investigate the x-ray emission process in four high-Z planar targets, namely, tungsten (W), gold (Au), lead (Pb), and uranium (U) irradiated by 1 ns, 351 nm flat top laser pulses. A thorough zoning analysis is performed for all laser-driven high-Z foils over a wide intensity range of 1012–1015 W/cm2 with appropriately chosen photon energy range and recombination parameter. The resulting variation of conversion efficiency over the full intensity range exhibits an optimum for all materials, which is explained by considering the characteristic emission contributions from two different regions of laser irradiated plasma, namely, conversion layer and re-emission zone. A new generalized single scaling relation based upon smooth broken power law is proposed for conversion efficiency variation along with the separate determination (ηS, ηM) in soft and hard/M-band x-ray regions. It has been observed that ηS for Pb and W always lies in between that for Au and U for intensities smaller than ∼3×1013 W/cm2. On further increase in intensity, ηS is observed to be maximum for Au and U, whereas it is minimum for W. Significant contribution to M-band conversion efficiencies is observed in all elements for intensities higher than ∼2×1013 W/cm2 with maximum and minimum values attained by W and U, respectively. The results are explained by considering the contributions from the emission coefficients of all materials in both conversion layer and re-emission zone up to corresponding photon cutoff energies at different laser intensities.

Generation of primary photons through inverse Compton scattering using a Monte Carlo simulation code

Photon sources based on inverse Compton scattering, namely, the interaction between relativistic electrons and laser photons, are emerging as quasimonochromatic energy-tunable sources either as compact alternatives to synchrotron facilities for the production of low-energy (10--100 keV) x rays or to reach the 1--100 MeV photon energy range, which is inaccessible at synchrotrons. Different interaction layouts are possible for electron and laser beams, and several applications are being studied, ranging from fundamental research in nuclear physics to advanced x-ray imaging in the biomedical field, depending on the radiation energy range, intensity, and bandwidth. Regardless of the specific application, a reliable tool for the simulation of the radiation produced is essential for the design, the commissioning, and, subsequently, the study and optimization of this kind of source. Different computational tools have been developed for this task, based on both a purely analytical treatment and Monte Carlo simulation codes. Each of these tools has strengths and weaknesses. Here, we present a novel Monte Carlo code based on geant4 for the simulation of inverse Compton scattering in the linear regime. The code produces results in agreement with cain, one of the most used Monte Carlo tools, for a wide range of interaction conditions at a computational time reduced by 2 orders of magnitude. Furthermore, the developed tool can be easily embedded in a geant4 user application for the tracking of photons generated through inverse Compton scattering in a given experimental setup.

Observation of Competitive Nonadiabatic Photodissociation Dynamics of H2S+ Cations.

A comprehensive understanding of dissociation mechanisms is of fundamental importance in the photochemistry of small molecules. Here, we investigated the detailed photodissociation dynamics of H2S+ near 337 nm by using the velocity map ion imaging technique together with the theoretical characterizations by developing global full-dimensional potential energy surfaces (PESs). Rotational state resolved images were acquired for the S+(4S) + H2 product channel. Significant changes in product total kinetic energy release distributions and angular distributions have been observed within a small excitation photon energy range of 5 wavenumbers. Analysis based on the full-dimensional PESs reveals that two nonadiabatic pathways determined by the transition state connecting two minima on the 12A' state are responsible for the dramatic variation of observed product distributions. The current study has directly witnessed the competitive photodissociation mechanisms controlled by a critical energy point on the PES, thereby providing in-depth insight into the nonadiabatic dynamics in photochemistry.

The soft X-ray monochromator at the SASE3 beamline of the European XFEL: from design to operation.

The SASE3 soft X-ray beamline at the European XFEL has been designed and built to provide experiments with a pink or monochromatic beam in the photon energy range 250-3000 eV. Here, the focus is monochromatic operation of the SASE3 beamline, and the design and performance of the SASE3 grating monochromator are reported. The unique capability of a free-electron laser source to produce short femtosecond pulses of a high degree of coherence challenges the monochromator design by demanding control of both photon energy and temporal resolution. The aim to transport close to transform-limited pulses poses very high demands on the optics quality, in particular on the grating. The current realization of the SASE3 monochromator is discussed in comparison with optimal design performance. At present, the monochromator operates with two gratings: the low-resolution grating is optimized for time-resolved experiments and allows for moderate resolving power of about 2000-5000 along with pulse stretching of a few to a few tens of femtoseconds RMS, and the high-resolution grating reaches a resolving power of 10 000 at the cost of larger pulse stretching.

Engineering the band gap and optical properties of a two-dimensional molybdenum carbon fluoride MXene

Using first-principles density functional theory, we investigated the electronic and optical properties of monolayer and multilayer nanosheets of molybdenum carbon fluoride (Mo2CF2), a two-dimensional (2D) transition-metal carbide MXene. The indirect band gap of the Mo2CF2 semiconductor can be engineered by controlling the number of layers where the band gap energy changes from 0.278 eV for the monolayer to 0.249 eV for the trilayer nanosheet. The decrease in band gap energy in the multilayer is due to interlayer coupling, which splits the bands according to the number of layers. Mo2CF2 behaves as a metal with an anomalous dispersion and high optical conductivity at incident photon energies of 0.68–2.19, 3.49–6.68 and 7.30–8.31 eV. It has a relatively low reflectivity and is absorbing over a broad range of photon energies from about 0.429 (2890), 0.387 (3204) and 0.345 eV (3594 nm) for the monolayer, bilayer and trilayer nanosheets, respectively, achieving peak absorption in the vacuum ultraviolet region at about 7.9 eV (157 nm). The optical properties of Mo2CF2 can likewise be tuned by varying the number of layers. The unique behavior of its optical properties along with the ability to control its electronic and optical properties enhances the potential of 2D Mo2CF2 for various applications in the fields of electronics and energy storage.