Absorption Spectrum Of Nitrogen Research Articles

Experimental and theoretical study of X-ray K edges absorption spectra of carbon and nitrogen in the phthalocyanine H2Pc molecule

The study of the electronic structure of H2Pc was carried out to examine the structure of the lowest unoccupied molecular orbitals (LUMO) of molecule phthalocyanine by X-ray absorption spectroscopy using quantum-chemical calculations. The theoretical calculations were performed on the stationary theory (frozen orbital approximation, Z+1 model) and time-dependent density functional theory (TDDFT). A consideration of K edges absorption spectra of carbon and nitrogen in the common scale of binding energies allows estimating the contributions of AO of all phthalocyanine atoms to the LUMO, defining the sequence of levels, the binding energies of the corresponding levels, and also the character of electronic interactions between individual atoms. It was shown that the best agreement between the experimental and theoretical pre-edge structures of the absorption spectra of nitrogen and carbon for H2Pc is observed in the case of the application of stationary density functional theory in Z+1 model to account for an X-ray hole. In this case the 2p π AO of the Nα(1,2) and Сα atoms make a predominant contribution to the LUMO. The 2p π AO of the Nα(1,2) atoms mainly contribute to the boundary LUMO with the energy ~–2.3 eV.

Vacuum ultraviolet spectrum of nitrogen in the solid state; pure and trapped in a neon matrix

The reflection spectrum of solid nitrogen and the absorption spectrum of nitrogen in a neon matrix have been studied in the wavelength region 500–1300 A using synchrotron radiation from the 2.5 GeV synchrotron in Bonn as a continuum light source. The reflection spectrum of solid nitrogen agrees with the absorption spectrum of solid nitrogen previously reported in the literature.

Characteristics of the X-ray absorption spectra of nitrogen in N2, N2O, and NO

Characteristics of the X-ray absorption spectra of nitrogen in N2, N2O, and NO

K emission and absorption spectra of nitrogen with the electron microprobe

AbstractThe K soft X‐ray emission profile of nitrogen in the vanadium nitride VN has been investigated with an electron microprobe. It is shown that this instrument is capable of sufficiently resolving the N K band to provide information about the filled states of the valence band. Moreover, with this same compound, the first K absorption spectrum of nitrogen has been obtained by a self absorption method. VN is only an experimental example. To find the complete picture of the electronic band structure of solid materials, similar emission and absorption spectra of nitrogen in some other interesting compounds can now be surveyed with the electron microprobe.

Infrared Techniques for Temperature Measurement in Plasmajets

The application of monochromatic radiation pyrometry to measurement of plasma temperatures was investigated. Infrared emission and absorption spectra of nitrogen, argon, and helium plasmajets, with various admixtures, were measured. Strong infrared emission was observed in various lines and bands in the plasma spectra, extending from the visible region to 7.0 μ. The observed infrared absorption was generally low. Temperatures measured ranged from below 2000 deg K for a N2 plasmajet heavily seeded with CO2, to 13,000 deg K for pure Ar. Temperature gradients in a plasmajet were inferred from observations made through various regions of the jet.

Absorption Spectrum of Nitrogen in the Region from 1075 to 1650 A

Using the argon continuum as a background, the absorption spectrum of N2 was reinvestigated in the region between 1075 and 1650 A. None of the absorption in this region reported by Weissler was observed. The Lyman-Birge-Hopfield absorption bands were extended up to v′=13. Below 1130 A, four bands were observed, three of which might be explained as the first three bands of transition C3Πu←X1∑g+.

Singlet Terms in the Spectrum of Molecular Nitrogen

IN recent papers communicated at about the same date, one of us1 has reported a number of singlet band systems in the absorption spectrum of nitrogen in the extreme ultra-violet, while the other2 has given details of several singlet systems obtained in emission in the near ultra-violet. These two sets of systems do not have any electronic levels in common as they are of different symmetry, but unfortunately the same letters have been used by both of us in designating some of the electronic states.