Resonant and Two-Step Processes

  • Vsevolod V. Balashov
  • Alexei N. Grum-Grzhimailo
  • Nikolai M. Kabachnik
Chapter
Part of the Physics of Atoms and Molecules book series (PAMO)

Abstract

Consider the angular distribution of photons emitted from an atomic discrete or autoionizing state excited by photon absorption (see Figure 4.1 for the scheme of the process under consideration):
$$A({\alpha _0}{J_0}) + {\gamma _0} \to {A^ * }(\alpha J) + \gamma $$
The processes in Figure 4.1 are often lumped together as resonance scattering of photons (resonance fluorescence). The second and the third ones, displayed in Figures 4.1(b) and 4.1(c), respectively, are processes of resonance inelastic scattering. In molecular optics, resonance inelastic scattering is known as Raman scattering: Figure 4.1(b) corresponds to emission of the red component, while Figure 4.1(c) corresponds to emission of the violet component in the Raman spectra. A rigorous treatment of the resonance scattering of photons is performed in the second-order perturbation theory of quantum electrodynamics. In our approach, the phenomenon is treated as a pure two-step process. Within the dipole approximation the tensor structure of the transition operator for both steps, excitation and decay, is the simplest, and all angular momenta involved in the phenomenon are fixed in an ideal case. As a result, the angular distributions and polarization can be exhaustively described only by methods of the angular momentum algebra without any dynamical evaluations.

Keywords

Angular Distribution Auger Electron Target Atom Stokes Parameter Scattered Photon 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 2000

Authors and Affiliations

  • Vsevolod V. Balashov
    • 1
  • Alexei N. Grum-Grzhimailo
    • 1
  • Nikolai M. Kabachnik
    • 1
  1. 1.Moscow State UniversityMoscowRussia

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