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Decay channels of Al L 2 , 3 excitons and the absence of O K excitons in α- Al 2 O 3

Decay channels of Al L 2 , 3 excitons and the absence of O K excitons in α- Al 2 O 3 The Al L 2 , 3 and O K thresholds for single-crystal α- Al 2 O 3 have been studied by photoemission. Energy-distribution curves, constant-initial-state (CIS), and constant-final-state (CFS) spectra are reported and compared to the absorption spectrum reported previously. An exciton appears as a doublet at threshold in the Al L 2 , 3 CFS, CIS, and absorption spectra. The details of the Al L 2 , 3 CFS spectrum and absorption spectrum are similar, while the exciton is the only feature present in the CIS spectrum. Comparisons of the various Al L 2 , 3 spectra allow the probabilities of different exciton decay channels to be determined. The probability for nonradiative direct recombination of the exciton is found to be (8±1)% and the probability for Auger decay of the exciton is found to be (72±20)%. Comparisons of the O K CIS and CFS spectra suggest that no O K exciton is formed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Decay channels of Al L 2 , 3 excitons and the absence of O K excitons in α- Al 2 O 3

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Publisher
American Physical Society (APS)
Copyright
Copyright © 1991 The American Physical Society
ISSN
1095-3795
DOI
10.1103/PhysRevB.44.13277
Publisher site
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Abstract

The Al L 2 , 3 and O K thresholds for single-crystal α- Al 2 O 3 have been studied by photoemission. Energy-distribution curves, constant-initial-state (CIS), and constant-final-state (CFS) spectra are reported and compared to the absorption spectrum reported previously. An exciton appears as a doublet at threshold in the Al L 2 , 3 CFS, CIS, and absorption spectra. The details of the Al L 2 , 3 CFS spectrum and absorption spectrum are similar, while the exciton is the only feature present in the CIS spectrum. Comparisons of the various Al L 2 , 3 spectra allow the probabilities of different exciton decay channels to be determined. The probability for nonradiative direct recombination of the exciton is found to be (8±1)% and the probability for Auger decay of the exciton is found to be (72±20)%. Comparisons of the O K CIS and CFS spectra suggest that no O K exciton is formed.

Journal

Physical Review B – American Physical Society (APS)

Published: Dec 15, 1991

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