Allowed and spin-forbidden electric dipole transitions in Ca I
Allowed and spin-forbidden electric dipole transitions in Ca I
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DOI：
10.1103/physreva.68.012507
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发表时间：
2003-07
影响因子：
2.9
通讯作者：
C. Fischer;G. Tachiev
中科院分区：
文献类型：
--
作者：
C. Fischer;G. Tachiev
用多组态Hartree-Fock方法，通过Breit-Pauli哈密顿量计入最低阶相对论效应，确定了直到3d4p{sup 1}F{sub3}{sup o}的所有能级的能级、跃迁几率和寿命。在4s5P{sup 1，3}P{sub1}{sup o}能级中，单重态和三重态的混合比4s4p{sup 1，3}P{sub1}{sup o}能级强得多。非相对论3d4p{sup 3}F{sup o}和{sup 1}D{sup o}项能量的近简并仅相差39.59 cm{sup-1}，导致3d4p{sup 3}F{sub2}{sup o}和{sup 1}D{sub2}{sup o}的Breit-Pauli能级高度混合。从这些能级出发的一些组合间跃迁的跃迁几率与较弱的自旋允许跃迁相似。4s4p{sup 3}P{sub1}{sup o}-4s4d{sup 1}D{sub2}跃迁的“微调”跃迁几率为1.53×10{sup 3}S{sup-1}，与在多普勒冷却实验中观察到的猝灭速率一致[Binnewies等，Phys.莱特牧师。87、123002(2001年)]。
Energy levels, transition probabilities, and lifetimes have been determined for all levels of the Ca I spectrum up to 3d4p {sup 1}F{sub 3}{sup o} using the multiconfiguration Hartree-Fock method with lowest-order relativistic effects included through the Breit-Pauli Hamiltonian. The mixing of singlet and triplet configuration states was found to be considerably stronger in 4s5p {sup 1,3}P{sub 1}{sup o} levels than in 4s4p {sup 1,3}P{sub 1}{sup o} levels. The near degeneracy of the nonrelativistic 3d4p {sup 3}F{sup o} and {sup 1}D{sup o} term energies, differing by only 39.59 cm{sup -1} resulted in highly mixed Breit-Pauli levels for 3d4p {sup 3}F{sub 2}{sup o} and {sup 1}D{sub 2}{sup o}. Some intercombination transitions from these levels have transition probabilities of magnitude similar to weaker spin-allowed transitions. The ''fine-tuned'' transition probability for the 4s4p {sup 3}P{sub 1}{sup o}-4s4d {sup 1}D{sub 2} transition was found to be 1.53x10{sup 3} s{sup -1}, in agreement with a quenching rate observed in a doppler cooling experiment [Binnewies et al., Phys. Rev. Lett. 87, 123002 (2001)].