Abstract
A tetradic scattering matrix formalism is proposed as a comprehensive framework for describing scattering and relaxation processes of both stationary and non-stationary systems. In the latter case (realized by the scattering of the molecular-maser beam) ordinary dyadic T-matrix formalism involving on-the-energy-shell scattering amplitudes is inadequate, the introduction of off-the-shell elements being required. Expressions are given relating the tetradic T-matrix elements to various scattering and attenuation rates (or cross sections). The relation to the tetradic level-shift operator in relaxation (linear response) theory is discussed. Photon absorption is presented as the successive occurrence of a scattering and a relaxation process, from the point of view of this formalism.
Original language | English |
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Article number | 016 |
Pages (from-to) | 1313-1327 |
Number of pages | 15 |
Journal | Journal of Physics A: Mathematical and General |
Volume | 8 |
Issue number | 8 |
DOIs | |
State | Published - 1975 |