Multichannel quantum-defect approach for two-photon processes

F. Robicheaux and Bo Gao
Phys. Rev. A 47, 2904 – Published 1 April 1993
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Abstract

We present a method which allows the efficient calculation of the amplitudes for two-photon processes based on variations of the eigenchannel R-matrix method and of the multichannel quantum-defect theory (MQDT). This method contains the flexibility to describe structure due to intermediate- as well as final-state Rydberg series, autoionizing series, and continua. Because the method is based on MQDT, we would be able to describe easily two-photon processes in negative ions as well as in any of the situations previously described by the generalization of MQDT in one-photon processes. We present calculations for two-photon absorption from the ground state of Mg and Ca.

  • Received 6 July 1992

DOI:https://doi.org/10.1103/PhysRevA.47.2904

©1993 American Physical Society

Authors & Affiliations

F. Robicheaux and Bo Gao

  • Joint Institute for Laboratory Astrophysics, University of Colorado, Boulder, Colorado 80309-0440

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Vol. 47, Iss. 4 — April 1993

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