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Journal of Physics Conference Series

Spectroscopy of Rydberg atoms in a Black-body radiation field: Relativistic theory of excitation and ionization

А. А. Свинаренко, О. Yu. Khetselius, Vasily V. Buyadzhi, T. A. Florko, Pavel A. Zaichko, Е. L. Ponomarenko

Published Nov 24, 2014• 36 citations
Publisher

Abstract

The combined relativistic energy approach and many-body perturbation theory with zeroth model potential approximation are used for computing Blackbody radiation ionization characteristics of the Rydberg atoms, in particular, the sodium in states with n=17,18,40-70. The calculated ionization rate values are compared with available theoretical and experimental data.

DOI
10.1088/1742-6596/548/1/012048

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The combined relativistic energy approach and many-body perturbation theory with zeroth model potential approximation are used for computing Blackbody radiation ionization characteristics of the Rydberg atoms, in particular, the sodium in states with n=17,18,40-70. The calculated ionization rate values are compared with available theoretical and experimental data.
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The combined relativistic energy approach and relativistic many-body perturbation theory with the zeroth Dirac-Fock-Sham approximation are used for computing the thermal Blackbody radiation ionization characteristics of the alkali Rydberg atoms, in particular, the sodium in Rydberg states with principal quantum number n=10-100. The detailed analysis of the data of computing ionization rates for the Rydberg sodium atom demonstrates physically reasonable agreement between the theoretical and experimental data. The accuracy of the theoretical data is provided by a correctness of the corresponding relativistic wave functions and accounting for the exchange-correlation effects.
We present the results of studying the spectroscopic characteristics of heavy Rydberg atomic systems in a black-body (thermal) radiation field. As theoretical approach we apply the combined generalized relativistic energy approach and relativistic many-body perturbation theory with ab initio Dirac zeroth approximation. There are presented the calculational data for the thermal black-body radiation ionization characteristics of the alkali Rydberg atoms, in particular, the sodium in Rydberg states with principal quantum number n=10-100 and ytterbium ion. Application of theory to computing the spectral parameters of studied atomic systems have demonstrated physically reasonable agreement between the theoretical and experimental data. The accuracy of the theoretical data is provided by a correctness of the corresponding relativistic wave functions and accounting for the exchange-correlation effects.
Results of theoretical calculations of ionization rates of Rb and Na Rydberg atoms by blackbody radiation (BBR) are presented. Calculations have been performed for nSnSnS, nPnPnP, and nDnDnD states of Na and Rb, which are commonly used in a variety of experiments, at principal quantum numbers n=8−−65n=8--65n=8−−65 and at three ambient temperatures of 77, 300, and 600K600\phantom{\rule{0.3em}{0ex}}\mathrm{K}600K. A peculiarity of our calculations is that we take into account the contributions of BBR-induced redistribution of population between Rydberg states prior to photoionization and field ionization by extraction electric field pulses. The obtained results show that these phenomena affect both the magnitude of measured ionization rates and shapes of their dependences on nnn. The calculated ionization rates are compared with the results of our earlier measurements of BBR-induced ionization rates of Na nSnSnS and nDnDnD Rydberg states with n=8−−20n=8--20n=8−−20 at 300K300\phantom{\rule{0.3em}{0ex}}\mathrm{K}300K. A good agreement for all states except nSnSnS with n>15n>15n>15 is observed. We also present the useful analytical formulas for the quick estimation of BBR ionization rates of Rydberg atoms.