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Refractive indices in the infrared were obtained from the following sources: KBr: Gmelin Handbuch der anorganischen Chemie; KI: ibid., pp. 603–604; KCl: ibid., p. 379; AgCl: L. W. Tilton, E. K. Plyler, and R. E. Stephens, J. Opt. Soc. Am. 40, 540 (1950).
There seem to be no data in the literature for the refractive indices of silver bromide and silver iodide in the infrared. The refractive index of AgBr was calculated from the assumed relationNAgBr=NAgClNKBr/NKCl. This calculation could not be applied in the case of AgI, since it is not isomorphic with the other compounds, and a consideration of the refractive indices of these various compounds in the visible frequency ranges shows that of Agi to be intermediate between those of AgBr and AgCl.
Infrared spectra of chloranil in various matrices: 1–KBr; 2–AgCl; 3–AgBr. Ordinates are optical density, but the curves are displaced to prevent overlapping.
Table I Christiansen effect, chloranil.
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