Description

The accurate radiative transitions probabilities, ionization rates are needed in astrophysics, the ultracold plasma diagnostics etc. We present an advanced relativistic model potential method to computing the spectra, radiation amplitudes for the K, Cs, Tl Rydberg atoms and ions, the ionization rates of states in the field of blackbody radiation. The master method is the combined energy approach [1] and relativistic many-body perturbation theory with the zeroth model potential approximation [2]. It provides sufficiently correct and simultaneously simplified numerical procedure to determination of the corresponding radiative transition and ionization properties. Interaction of the Rydberg atom A(nL) with the blackbody radiation induces transitions to the bound states and states of continuum: A(nL)+hwBBR->A+ + e-, where hwBBR - an energy of the BBR photon; , A+ is the corresponding ion. Probabilitiy of blackbody radiation induced transition between the nlj and n’l’j’ states is determined by the radiative matrix element and number of photons for ωnn . A rate of ionization in the initial bound Rydberg state nl is determined by an intergral (integration is carrying out on the BBR frequency) ~, where ЕnL –is the threshold frequency of ionization of the Rydberg atom state. The energy parameters, radiation amplitudes for the Rydberg atoms K, Cs, Tl and their ions ionization rates of states with n = 10-100 in the blackbody radiation field (T=300-600K) are presented and compared with available experimental and the alternative theories data [3]. References : [1] A.Glushkov, L.Ivanov, Phys.Lett. A170, 33-37 (1992); L.Ivanov etal, Phys.Rev.A48, 4365-4378 (1993); A.Glushkov, Progr. Theor. Chem. Phys. 26, 231-254 (2013). [2]. O. Khetselius, Progr. Theor. Chem. & Phys. 26, 217-230 (2013); 29, 54-76 (2015). [3] D.Kleppner etal, Phys.Rev.A26, 1490-1498 (1982); L.Lehman, J.Phys.B16, 2145-2152 (1983); V. Glukhov, D. Ovsiannikov, J.Phys. B42, 075001 (2009); I.Beterov etal, New J. Phys. 11, 013052 (2009).