2002 journal article

Auger width and branching ratios for berylliumlike 1s2s(2)np P-1(0) and 1s2p(3 1)P(0) resonances and photoionization of beryllium from 1s(2)2s2 S-1


By: H. Lin n, C. Hsue* & K. Chung n

UN Sustainable Development Goal Categories
14. Life Below Water (Web of Science)
Source: Web Of Science
Added: August 6, 2018

The photoionization cross section (PICS) of Be from the ground state is studied with the saddle-point complex-rotation method for photon energies from 25 to 122 eV. A full-core plus correlation wave function is used for the ground state. For the resonances in the continuum, the energy and width for the singly core-excited Be-like ${1s2s}^{2}2p{}^{1}{P}^{o},$ ${1s2p}^{3}{}^{1}{P}^{o},$ and ${1s2s}^{2}3p{}^{1}{P}^{o}$ are calculated to high precision. The PICS are studied with a single open-channel approximation as well as fully coupled open channels. The Auger decay branching ratios of these states are studied to check the spin-alignment theory recently proposed by Chung. These results are compared with the existing theoretical and experimental data in the literature. For beryllium, our energy and width of ${1s2s}^{2}2p$ are 115.513 eV and 36.6 meV and those of ${1s2s}^{2}3p$ are 121.420 eV and 50.4 meV, which agree with the experiment of Caldwell et al., [Phys. Rev. A 51, 542 (1990)].