Abstract
THE note by Drs. Ellis and Lyon appears to leave no longer tenable the hypothesis of carbon dioxide impurity as the cause of the 2.73 absorption band in fused silica. They suggest searching for higher overtone bands as a method of identifying the impurity. From my published curves1 in the shorter wave-length region. it will be seen that though the 2.73 band appears with considerable intensity in Section C (29.85 mm. thickness) the water vapour bands near 1.36 and also 1.87 are absent, though they might have been expected with intensities of the order of 10–20 per cent. The water vapour band near 6 would not be expected to show, even if present, in Section H (0.109 mm. thickness), since here the thickness of material is much too small.
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Drummond, Proc. Roy. Soc., A, 153, 328 (1936).
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DRUMMOND, D. The 2.73 Absorption Band of Fused Silica. Nature 139, 70 (1937). https://doi.org/10.1038/139070b0
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DOI: https://doi.org/10.1038/139070b0
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