Luminescence of F Centers in Alkali Halides under Hydrostatic Pressure
Luminescence of F Centers in Alkali Halides under Hydrostatic Pressure
dc.contributor.author | Brothers, A. D. | |
dc.contributor.author | Lynch, David | |
dc.contributor.author | Lynch, David | |
dc.contributor.department | Physics and Astronomy | |
dc.date | 2018-02-15T18:02:29.000 | |
dc.date.accessioned | 2020-06-30T06:17:32Z | |
dc.date.available | 2020-06-30T06:17:32Z | |
dc.date.copyright | Sun Jan 01 00:00:00 UTC 1967 | |
dc.date.embargo | 2015-01-15 | |
dc.date.issued | 1967-12-01 | |
dc.description.abstract | <p>F-center luminescence spectra have been measured at 78°K in NaCl, KCl, KBr, KI, RbCl, and CsBr under hydrostatic pressure to 3.5 kbar. From a comparison between the shift of the emission peak with pressure and the shift with temperature, it is concluded that most of the latter arises from the electron-lattice interaction and not from thermal expansion. This is the opposite of the conclusion for F-center absorption, for which thermal expansion dominates the temperature coefficient of the peak energy. The halfwidth of the function W(E), the probability per unit time of emitting a photon with energy between E and E+dE, does not vary with pressure in NaCl, KCl, and RbCl, but the half-width of the "shape function," E−3W(E), changes with pressure. This is interpreted as meaning that for F-center emission, it is more suitable to make the Condon approximation on the momentum operator than on the position operator. Lifetime measurements in KCl under pressure at 15 and 78°K give the pressure derivative of the thermal ionozation energy of the relaxed excited state of the F center in KCl, + 19×10−6 eV bar−1. The pressure coefficients of a few K- and L-band peaks have been determined. These provide additional evidence that the final states in the L-band transitions are not similar to those for F- and K-band transitions. The K band in RbCl changes shape with pressure. The FA-band splitting has been found to increase with pressure in KCl:Na. The F-center emission in KBr under pressure has been found to have two components, and the excitation spectrum has two peaks, the F band and a peak very close to the K′band previously found in absorption at much higher pressures. Emission data at 12°K on diverse samples of additively colored KBr strongly suggest that there are two components to the normal F-center luminescence in KBr with no applied pressure.</p> | |
dc.description.comments | <p>This article is from <em>Physical Review</em> 164 (1967): 1124, doi:<a href="http://dx.doi.org/10.1103/PhysRev.164.1124" target="_blank">10.1103/PhysRev.164.1124</a>. Posted with permission.</p> | |
dc.format.mimetype | application/pdf | |
dc.identifier | archive/lib.dr.iastate.edu/physastro_pubs/18/ | |
dc.identifier.articleid | 1010 | |
dc.identifier.contextkey | 6530629 | |
dc.identifier.s3bucket | isulib-bepress-aws-west | |
dc.identifier.submissionpath | physastro_pubs/18 | |
dc.identifier.uri | https://dr.lib.iastate.edu/handle/20.500.12876/56924 | |
dc.language.iso | en | |
dc.source.bitstream | archive/lib.dr.iastate.edu/physastro_pubs/18/1967_Lynch_LuminescenceFCenters.pdf|||Fri Jan 14 21:33:00 UTC 2022 | |
dc.source.uri | 10.1103/PhysRev.164.1124 | |
dc.subject.disciplines | Atomic, Molecular and Optical Physics | |
dc.subject.disciplines | Physics | |
dc.subject.keywords | electron-lattice | |
dc.subject.keywords | excitation spectrum | |
dc.title | Luminescence of F Centers in Alkali Halides under Hydrostatic Pressure | |
dc.type | article | |
dc.type.genre | article | |
dspace.entity.type | Publication | |
relation.isAuthorOfPublication | fa3aaf34-6c45-4f1c-9296-edcfc98e117b | |
relation.isOrgUnitOfPublication | 4a05cd4d-8749-4cff-96b1-32eca381d930 |
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