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Exciton Transition of SnI 2 at the Fundamental Absorption Edge
Author(s) -
Yoshida H.,
Ohno N.,
Fujita M.
Publication year - 1997
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(199709)203:1<281::aid-pssb281>3.0.co;2-v
Subject(s) - exciton , absorption edge , absorption (acoustics) , spectral line , absorption spectroscopy , reflection (computer programming) , monoclinic crystal system , materials science , molecular physics , band gap , condensed matter physics , chemistry , atomic physics , optics , crystallography , physics , crystal structure , quantum mechanics , computer science , programming language
Polarized absorption and reflection spectra of monoclinic SnI 2 crystals have been measured in the fundamental absorption region at temperatures between 6 and 300 K. The square‐root like structure at the fundamental absorption edge observed by Gorban et al. has been found not to appear in the absorption spectra for purified single crystals. The temperature dependence of the spectral lineshape has revealed that the lowest energy gap of SnI 2 is of direct type, which is contrary to the expectation of the band calculation. The lowest exciton transition in SnI 2 is discussed on the basis of the present results.