Transition probabilities for two-photon H(1s–2s) and He(11s–21s) transitions: A partial-closure approach
Click here to view fulltext PDF
Permanent link:
https://www.ias.ac.in/article/fulltext/pram/054/03/0377-0384
Transition amplitudes and transition probabilities for the two-photon 1s–2s transition in the hydrogen atom and 11s–21s 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 21s 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.
Volume 97, 2023
All articles
Continuous Article Publishing mode
Click here for Editorial Note on CAP Mode
© 2022-2023 Indian Academy of Sciences, Bengaluru.