Transition probabilities for two-photon H(1s鈥?s) and He(11s鈥?1s) transitions: A partial-closure approach
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- 作者：Monika Bassi (1)
K L Baluja (1) - 关键词：Transition probability ; two ; photon transition ; closure approximation ; mean excitation energy
- 刊名：Pramana
- 出版时间：March 2000
- 出版年：2000
- 期刊代码：183_0973-7111
- 类别：ph
- 卷：54
- 期：3
- 页码：377-384
- 数据来源：sp
摘要
Transition amplitudes and transition probabilities for the two-photon 1s–2s transition in the hydrogen atom and 11 s–21 s transition in helium atom have been calculated using a partial-closure approach. The dominant term is calculated exactly and the remaining sum over intermediate states is calculated using a mean excitation energy. Our value of the transition amplitudes agree within 2%with the exact results for the hydrogen case. Our value of the transition probability for hydrogen is 8.50 s−1 which is in good accord with its known value 8.226 s−1. For helium, the photon energy distribution of the metastable 21 s state is in good agreement with the accurate values. The corresponding transition probability is 53.7 s−1 which is in good agreement with the accurate value 51.3 s−1.