Decay of the resonantly excited states of atomic Kr

Abstract

The 3p '~5s ' resonant excitation energy and decay width of Kr atoms are calculated by an ab initio Green's-function method. The dipolar relaxation energy shift of the 3p ' -+Ss' resonantly excited state of Kr atoms is predominantly due to the 3p '5s'~3d 25s'sf super-Coster-Krouig (sCK) spectator decay process. The calculated excitation energies are overestimated by about 1. 0 eV. The decay widths for 3p /2~5 s ' and 3p3/2~5 s ' resonantly excited states are 2.08 and 1.88 eV, respectively. They are larger than the decay widths of the 3p &/& and 3p3/g core-level ionized states. The increase of the decay width is a result of the decrease of 3p '5s '~3 d~5s 's f sCK spectator decay aud the increase of 3p '5s' -+3d '4s(p) '5s'cp(d) CK spectator decay. The changes of the (s)CK decay rates are due to the screening of the final two-hole-state potential by the resonantly excited 5s electron.PACS number(s): 32.30. Rj, 32.70.Jz, 32.80.0z, 32.80.Hd