Abstract

The general S-matrix theory of multiphoton ionization is presented. The freedom in the form of the S matrix is discussed and exploited to derive a form that uses the exact dressed state as the initial state of the process. This results in a new S-matrix form, which is then evaluated in an approximate form. The numerical result is identical with a previously obtained one but radically different from that obtained by using the Keldysh–Faisal–Reiss theories.

© 1990 Optical Society of America

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