Influence of cleavage in liquid helium on the shape of the n=1 exciton reflection band in KI and RbI crystals

Autor:	A A O'Connel-Bronin
Rok vydání:	1994
Předmět:	Photon Chemistry Liquid helium Exciton Cleavage (crystal) Condensed Matter Physics Crystallographic defect Molecular physics law.invention Crystal Condensed Matter::Materials Science Crystallography law General Materials Science sense organs Irradiation Dislocation
Zdroj:	Journal of Physics: Condensed Matter. 6:2847-2852
ISSN:	1361-648X 0953-8984
DOI:	10.1088/0953-8984/6/15/007
Popis:	A noticeable change in the n=1 exciton reflection band of KI and RbI crystals exposed to air was revealed after cleavage in liquid helium. This change is explained by disturbance of the near-surface layer by charged surface dislocations and other defects, which appeared after cleavage at a low temperature. A moderate irradiation by photons in the exciton region and/or heating leads to the removal of the disturbance and, correspondingly, to relaxation of the crystal surface.
Databáze:	OpenAIRE
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