Symmetry of Vibrationally Assisted Electronic Absorption and Emission Band Shapes of Impurities in Solids
- 1 September 1973
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 8 (5), 1806-1810
- https://doi.org/10.1103/physrevb.8.1806
Abstract
For impurities that couple to the lattice through an interaction containing both linear and quadratic terms, mirror symmetry, at and above , of the resulting absorption and emission spectra about the zero-phonon line is highly dependent on the strength of the quadratic interaction parameter. Exact symmetry at all temperatures occurs only for the linear interaction. Overlap of the linear-plus-quadratic interaction spectra, although always in the vicinity of the zero-phonon line, is exactly coincident with the zero-phonon line at . Values of the linear and quadratic interaction parameters can be determined from the shapes of experimental broad-band spectra, the spacings of "hot lines," and the intensities of the zero-phonon lines.
Keywords
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