We introduce a perturbation theory using dressed bound states to include higher-order transition processes in the calculation of atomic multiphoton ionization. We calculate the ionization probability of hydrogen atoms using this theory and compare the results with the lowest-order perturbation result. We also calculate the shift of the hydrogen atom’s ground state that is due to the external field.
© 1987 Optical Society of America
Liwen Pan, Bala Sundaram, and Lloyd Armstrong, Jr., "Dressed-state perturbation theory for multiphoton ionization of atoms," J. Opt. Soc. Am. B 4, 754-758 (1987)