One-and two-photon free-free transitions in a coulomb field

  • Alfred Maquet
III Models and Phenomena
Part of the Lecture Notes in Physics book series (LNP, volume 211)


We have presented recent applications of two different representations of the Coulomb Green's function in the field of atomic physics. The so-called sturmian expansion of the CGF has been used for computing two-and three-photon “above threshold” ionization cross sections, processes in the course of which the photoelectrons experience (virtual) free-free transitions. Our computation has permitted to discard a recent hypothesis which had been formulated in order to interpret recent experimental results. We have presented also a progress report on the calculation of two-photon transitions amplitudes in the continuous spectrum of a Coulomb field. Our calculation, performed within the framework of a perturbative theory, relies on the use of the Schwinger representation of the CGF. Our “exact” results will permit to assess the respective ranges of validity of both the perturbative and non-perturbative approaches. These two examples clearly illustrate the usefulness of the compact representation of the CGF presented here,for performing perturbative computations in a Coulomb field.


Laser Field Ionization Cross Section Coulomb Field Pad4 Approximants Photoelectron Experience 
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Copyright information

© Springer-Verlag 1984

Authors and Affiliations

  • Alfred Maquet
    • 1
  1. 1.Laboratoire de Chimie PhysiqueUniversité Pierre et Marie CurieParis Cedex 05France

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