Influence Of Hyperfine Structure Research Articles

Theoretical and experimental investigation of magnetic resonance on the Cs hyperfine structure

When the influence of hyperfine structure is ignored for atomic magnetometers, it will lead to considerable measuring errors in some cases. Considering the Cs hyperfine structure, an analytical form of magnetic resonance spectrum of the exciting-field frequency response is obtained through theoretical derivation, which is verified by the experiment. Based on the results of the experimental scheme, the optimal frequency and intensity of pump light for a Cs atomic magnetometer with well-resolved magnetic resonance spectrum are found. Additional applications in minimizing the measuring error of atomic magnetometers and the study of optical pumping are explored.

Manipulating ultracold polar molecules with microwave radiation: The influence of hyperfine structure

We calculate the microwave spectra of ultracold KRb alkali metal dimers, including hyperfine interactions and in the presence of electric and magnetic fields. We show that microwave transitions may be used to transfer molecules between different hyperfine states, but only because of the presence of nuclear quadrupole interactions. Hyperfine splittings may also complicate the use of ultracold molecules for quantum computing. The spectrum of molecules oriented in electric fields may be simplified dramatically by applying a simultaneous magnetic field.

The influence of hyperfine structure on some manganese line profiles in the solar spectrum

Taking into account effects of hyperfine structure, we calculated the synthetic solar spectrum for wavelength intervals around nine neutral manganese lines. To estimate values of hyperfine components we used the Oxford total absorption oscillator strength measurements (Booth et al. 1983). We compared observed profiles (Photometric Atlas of the Solar Spectrum from 3000 to 10000 ?(Delbouille et al. 1973)) of selected manganese lines with synthesized profiles in two cases: when hyperfine structure is not and when it is taken into account. By comparing the calculated with observed spectrum, we corrected the total oscillator strengths of all nine selected manganese lines.

The influence of hyperfine structure and isotope shift on the detection of Rb by 2f-wavelength modulation diode laser absorption spectrometry—experimental verification of simulations

This work presents an experimental verification of a previously developed methodology for simulation of the 2f-wavelength modulation diode laser absorption spectrometry technique (2f-WM-DLAS) when ...

The influence of hyperfine structure on the determination of the ionisation potential of Tl I

New high-resolution spectra of Tl I are reported in the wavelength range 2100-2000 AA using the first order of a 3 m 6000 line/mm holographic grating. Synchrotron radiation from the 500 MeV accelerator in Bonn provided the background source of continuum. The observations comprise 6s26p2P1/2 to 6s2ns2S1/2 (12<n<48) and 6s2nd2D3/2 (12<n<70) spectra extending to much higher values of n than previous work. The authors have resolved the hyperfine structure of the ground state which is shown to have a significant effect on the determination of the ionisation potential.

Electron polarised photon coincidence parameters for the sodium D lines

A delayed-coincidence technique has been used to measure the linear and circular polarisation fractions of the photons arising from the electron impact excitation of the 32P states of sodium at an incident electron energy of 100 eV. These measurements yield lambda , the ratio of The differential cross sections for the excitation of the magnetic sublevels, as well as information on the orientation of the excited atom. The influence of hyperfine structure in the excited state on the polarisation vector has been included in the analysis. The measured parameters are found to disagree with those predicted by a distorted-wave polarised-orbital calculation and with the first Born approximation.

An Interferometric Investigation of the Effect of Hyperfine Structure on Solar Line Profiles

Abt has discussed the possible influence of hyperfine structure on solar line profiles. Allowing for hyperfine structure, and with the aid of detailed assumptions concerning physical conditions on the Sun, he reproduced the Utrecht profile of the weak manganese line λ 5516.8. This paper describes the inter-ferometric investigation of the moderately strong manganese lines λλ 6021, 6016, 6013, and the iron line λ 6027. The method of circular channels was used, but with the line under examination at the centre of the heterochromatic fringe system. A solar absorption coefficient is deduced from the iron line profile, and this is used to compute the profiles of the manganese lines allowing for hyperfine structure. The only major assumption necessary concerning solar conditions is that the lines are all formed in the same level of the solar atmosphere. The computed and observed profiles agree within the limits of experimental error, and are substantially different from the manganese line profiles computed on the assumption of no hyperfine structure.