中国物理B ›› 2007, Vol. 16 ›› Issue (2): 374-381.doi: 10.1088/1009-1963/16/2/017
熊庄1, BacalisNC2
Xiong Zhuang(熊庄)a)† and Bacalis N Cb)
摘要: By taking full account of the non-orthogonality of the orbitals between the low-lying doubly excited states 1Po and the singly excited states 1Se and 12De of He, the corresponding radiative decay rates have been investigated theoretically via analytic generalized Laguerre-type atomic orbitals at a nearly numerical multi-configuration self-consistent field accuracy in a general non-orthogonal configuration interaction scheme. From these rates, we calculate the VUV photon emission and metastable atom spectra, and both are found to be in good qualitative agreement with recent excellent measurements. We obtain, successfully, the enhancement of the VUV photon spectrum, experimentally observed at the energy of (2s4p-4s2p)/(2p,3d) 1Po as compared with other nearby lying states. The mechanism proposed by Odling-Smee et al is verified, implying that taking appropriate account of the overlap existing between orbitals of the low-lying doubly excited and singly excited states (especially important for the compact orbitals) can reveal basic physical dominant mechanism and is crucial in understanding these spectra.
中图分类号: (Electron correlation calculations for atoms and ions: excited states)