Abstract
IN 1935 Barnes, Brattain and Seitz1, investigating the absorption of magnesium oxide in the infra-red, reported some forty or so fine absorption lines in the range from 6µ to 15·6 µ. In 1934 Fock2, using fumed magnesium oxide, had reported the eigen-frequency to be at 17·3 µ, with subsidiary maxima at 14·8 µ, 6·8 µ and 25 µ, but no fine structure. Such a fine structure was hitherto unknown for face-centred cubic crystals, though it has been reported for quartz3 and calcite4. The theory advanced by these authors to explain the fine structure is based on the interaction of crystal vibrations as originally suggested by Born and Blackman5 ; but the assumptions which lead to the details of the fine structure do not appear to be correct6.
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References
Barnes, Brattain and Seitz, Phys. Rev., 48, 582 (1935).
Fock, J., Z. Phys., 90, 44 (1934).
Silverman, S., and Hardy, J. D., Phys. Rev., 37, 176 (1931).
Silverman, S., Phys. Rev., 39, 72 (1932).
Born, M., and Blackman, M., Z. Phys., 82, 551 (1933).
Blackman, M., Phil. Trans., 236, 103 (1936).
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WILLMOTT, J. Absorption of Magnesium Oxide in the Infra-Red Region. Nature 162, 996 (1948). https://doi.org/10.1038/162996a0
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DOI: https://doi.org/10.1038/162996a0
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