Multiphoton Free-Free Transitions

  • A. Weingartshofer
  • J. K. Holmes
  • J. Sabbagh
Conference paper
Part of the Springer Series in Optical Sciences book series (SSOS, volume 30)


In an electron-atom (molecule) scattering process the electron changes its direction; it is accelerated and so it can emit electromagnetic radiation, so-called Bremsstrahlung. For electrons with energies in the order of 10eV the spontaneous emission of a photon with a measurable energy has such a low probability that it is totally negligible. However, in a sufficiently intense external laser field we can have induced emission and absorption; and if the intensity is moderately high, very distinct non-linear processes can be observed in which the scattered electrons change their energy by integer multiples of the photon energy. Because in such transitions the electron proceeds from one continuum state to another, these processes are also called free-free (F-F) transitions [1,2] and can be represented as
$$ {e^ - }\left( {{E_i}} \right) + Atom + Laser \to {e^ - }\left( {{E_i} \pm N\hbar \omega } \right) + Atom + Laser. $$


Bessel Function Laser Field Laser Photon Elastic Peak Detailed Theoretical Analysis 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1981

Authors and Affiliations

  • A. Weingartshofer
    • 1
  • J. K. Holmes
    • 1
  • J. Sabbagh
    • 2
    • 1
  1. 1.Department of PhysicsSaint Francis Xavier UniversityAntigonishCanada
  2. 2.Laboratoire de Recherche en Optique et Laser, Département de PhysiqueUniversité LavalQuébecCanada

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