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EXAFS measurements of bond-stretching force constants in arsenic and arsenic compounds

Authors
Journal
Solid State Communications
0038-1098
Publisher
Elsevier
Publication Date
Volume
63
Issue
3
Identifiers
DOI: 10.1016/0038-1098(87)90842-8
Disciplines
  • Physics

Abstract

Abstract The Einstein frequency ν E obtained from temperature-dependent EXAFS measurements for the bond between an arsenic atom and a nearest neighbor in arsenic and certain arsenic halides and chalcogenides is considered. It is shown theoretically that in these materials ν E should be approximately equal to the “natural” frequency of the bond, and hence that ν E 2 is proportional to the bond-stretching force constant ⨍ r . Experimental EXAFS measurements on crystalline ( c-) AsBr 3 and AsI 3, glassy ( g-) As 2S 3 and As 2Se 3, and amorphous ( a-) As yield force constants in reasonable agreement with those obtained from Raman and infrared studies.

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