Multiphoton Transitions in Helium between 1S and 2S Levels.
NAVAL ORDNANCE LAB WHITE OAK MD
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An extension of the momentum-translation approximation to include many-electron systems is presented. The multiphoton 1S-2S transition amplitude for a helium atom in the presence of combined intense and weak electromagnetic fields is calculated. Nonperturbative behavior of the results is exhibited at high intensities. Author
- Atomic and Molecular Physics and Spectroscopy