Quantum seminar | 30 October 2024

The talk will present the results of theoretical calculations of the probabilities of one-, two-, and multiphoton emission in the hydrogen atom in the presence or absence of an external electric field [1-3]. Two-photon decays of different multipoles with corresponding estimates for hydrogen-like highly charged ions are considered. An analysis of cascade processes will be presented, in which the emission of purely non-resonant radiation is discussed [4,5]. Such questions as comparative analysis of spectra of hydrogen and antihydrogen atoms, formation of the cosmic microwave background and ‘detachment’ of radiation from matter will be touched upon as applications [6].

Main paper/arXiv, related to the seminar, and other references:

1. L. N. Labzowsky, A. V. Shonin and D. A. Solovyev, QED calculation of E1M1 and E1E2 transition probabilities in one-electron ions with arbitrary nuclear charge, J. Phys. B: At. Mol. Opt. Phys. 38, 265 (2005).
2. D. Solovyev, L. Labzowsky, G. Plunien and V. Sharipov, Influence of external electric fields on multi-photon transitions between the 2s, 2p and 1s levels for hydrogen and antihydrogen atoms and hydrogen-like ions, J. Phys. B: At. Mol. Opt. Phys. 43, 074005 (2010).
3. D. Solovyev, E. Solovyeva, Rydberg-state mixing in the presence of an external electric field: Comparison of the hydrogen and antihydrogen spectra, Phys. Rev. A 91, 042506 (2015).
4. L. Labzowsky, D. Solovyev, G. Plunien, Two-photon decay of excited levels in hydrogen: the ambiguity of the separation of cascades and pure two-photon emission, Phys. Rev. A 80, 062514 (2009).
5. D. Solovyev, L. Labzowsky, Two-photon approximation in the theory of electron recombination in hydrogen, Phys. Rev. A 81, 062509 (2010).
6. T. A. Zalialiutdinov, D. A. Solovyev, L. N. Labzowsky and G. Plunien, QED theory of multiphoton transitions in atoms and ions, Phys. Rep. 737, 1 (2018).