Abstract
A recently developed theory for electron-atom interactions in intense, high-frequency laser field is used as framework for the calculation of the levels of a hydrogen atom placed in a monochromatic, linearly polarized plane wave. An appropriate level-classification scheme is introduced, similar to that for homonuclear diatomic molecules. To lowest order within the theory, the levels depend on the frequency ω and on the intensity I of the plane wave only through the parameter α 0=I 1 2 ω -2 (au). We have computed the levels corresponding to principal quantum number n⩽4 over an extended range of α 0 values (0<α 0<100). A drastic decrease of the ionization potential with α 0 was found, which is of considerable consequence for the energy spectrum of the ionized electrons. A new peak pattern is predicted, differing from that currently seen in multiphoton ionization experiments: no peak suppression occurs now, and substantial shifts of the peaks with respect to the weak field case may appear.
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