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Optical Anisotropy of MgF, in Its UV Absorption Region
Author(s) -
Thomas J.,
Stephan G.,
Lemonnier J. C.,
Nisar M.,
Robin S.
Publication year - 1973
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/pssb.2220560115
Subject(s) - anisotropy , symmetry (geometry) , absorption (acoustics) , crystal (programming language) , range (aeronautics) , point group , interpretation (philosophy) , plasmon , optical anisotropy , physics , reflectivity , optics , chemistry , materials science , molecular physics , condensed matter physics , geometry , mathematics , computer science , composite material , programming language
Reflectance measurements are used to calculate the ordinary and extraordinary optical constants of an anisotropic MgFz crystal in the energy range 11 to 28 eV. Partially linearly polarized light is used and a method of least squares is employed to compute the results. An excitonic splitting of 0.5 eV is observed at the r point. The anisotropy of the forbidden gap is 0.2 eV while that of plasmon is 0.3 eV. A tentative interpretation is given based upon a symmetry group analysis at the T point.