Abstract
IN 1895 Merritt,1 observing the infra-red absorption in the 2.9μ region of a beam passing at right angles to the axis in crystalline quartz, found a definite difference when the radiation was polarised in planes at right angles and parallel to the axis. That is, the ordinary and extraordinary rays respectively were differently absorbed. The absorption of a beam parallel to the axis was, as was to be expected, similar to that of the ordinary ray in the first case. Koenigsberger2 in 1897 made like observations.
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References
Ann. Phys., 55, 49; 1895.
Ann. Phys., 61, 687; 1897.
Z. Phys., 42, 426; 1927.
Phys. Rev., 39, 562; 1932.
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DRUMMOND, D. Infra-Red Absorption of Quartz. Nature 130, 928–929 (1932). https://doi.org/10.1038/130928b0
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DOI: https://doi.org/10.1038/130928b0
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