Multichannel quantum-defect approach for two-photon processes

Journal Article · Wed Mar 31 23:00:00 EST 1993 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.47.2904· OSTI ID:6941559

Robicheaux, F; Gao, B ^[1]

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1. Joint Institute for Laboratory Astrophysics, University of Colorado, Boulder, Colorado 80309-0440 (United States)

We present a method which allows the efficient calculation of the amplitudes for two-photon processes based on variations of the eigenchannel [ital 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.

• DOE Contract Number: FG02-90ER14145
• OSTI ID: 6941559
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 47:4; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION
ALKALINE EARTH METALS
ATOM COLLISIONS
CALCIUM
CALCULATION METHODS
COLLISIONS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
GROUND STATES
MANGANESE
MATRICES
MECHANICS
METALS
MULTI-PHOTON PROCESSES
PHOTON COLLISIONS
PHOTON-ATOM COLLISIONS
QUANTUM MECHANICS
R MATRIX
RYDBERG STATES
SORPTION
TRANSITION ELEMENTS