Be,Mg和Ca原子电四极矩E2^1D—^1S跃迁的能级和跃迁概率

THEORETICAL ELECTRIC QUADRUPOLE ENERGY LEVELS AND TRANSITION PROBABILITIES FOR THE LOWEST 1D METASTABLE STATE IN Be,Mg AND Ca

利用多组态Dirac Fock广义扩展平均能级 (MCDF EAL)方法系统地计算了重要的中性原子Be,Mg和Ca单光子电四极矩E2 1D—1S光谱跃迁的能级间隔和跃迁概率 ,计算中考虑了重要的核的有限体积效应 ,Breit修正和QED修正 ,所得结果和最近的实验数据及理论计算值进行了比较 .此外还从理论上预言了Ba和Mg单光子电四极矩E2 1D—1S光谱跃迁概率过程 ,在库仑规范中 ,跃迁概率A(Be) =3884 9s-1,跃迁概率A(Mg) =2 35 7 2s-1和跃迁概率A(Ca) =48 1s-1.

The important electron quadrupole 1D? ? 1S transition probabilities for Be, Mg and Ca have been computed using a fully relativistic multiconfiguration Dirac\|Fock method with Breit and QED corrections. In Coulomb gauge, our computed Einstein coefficient for Ca of 48.1s -1 is in good agreement with the recent experimental value of 40±8s -1 .Our best Einstein coefficients for Be and Mg are 3884.9s -1 and 2357.2s -1 ,respectively. The existing discrepancy between theory and experiment in Ca is eliminated. There are no previous results for Be and Mg.