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Ultraviolet Absorption of Hg 2 Cl 2 ‐and Hg 2 Br 2 Single Crystals
Author(s) -
Bryknar Z.,
Hersel W.,
Barta Č.
Publication year - 1982
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170170406
Subject(s) - exciton , absorption edge , absorption (acoustics) , halide , absorption spectroscopy , spectral line , halogen , chemistry , range (aeronautics) , ultraviolet , atomic physics , analytical chemistry (journal) , materials science , molecular physics , optics , physics , condensed matter physics , optoelectronics , inorganic chemistry , band gap , alkyl , organic chemistry , astronomy , composite material , chromatography
The optical unpolarized absorption spectra of Hg 2 Cl 2 and Hg 2 Br 2 single crystals were measured in the spectral range 230–400 nm. A sharp exciton peak and other absorption bands of both halides were observed near the fundamental absorption edge. The absorption peaks due to the splitting of the halogen doublet were also observed. Positions of the exciton peaks are characteristic for the Frenkel (localized) type of excitons. Possible interpretations of the other observed bands are discussed.