Phys. Rev. A 69, 033407 (2004) [5 pages]Nonresonant multiphoton ionization in atomic hydrogenReceived 18 November 2003; published 22 March 2004 The infinite summations over the complete set of unperturbed atomic states appearing in the Nth-order perturbation theory for multiphoton ionization are performed using the Dalgarno-Lewis method. The relevant transition matrix elements are written in a closed integral form exhibiting all the analytic properties of the amplitude as a function of incident photon energy. The cross sections for two- and three-photon ionization for atomic hydrogen are calculated for both linearly and circularly polarized light with a wide range of photon energy spectrum including the near resonance, and numerical comparison is made with the values obtained by different methods. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.69.033407
DOI:
10.1103/PhysRevA.69.033407
PACS:
32.80.Rm, 42.50.Hz
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