Abstract
DRS HASTED, ZAFAR AND CHAMBERLAIN REPLY: Although he has cast us1 in the role of Inspector Lestrade2, Dr Whalley3 performs a useful service by questioning our neglect of resonance absorptions in the discussion of the enhanced permittivity increment, ɛ∞− n2, of water. Complete analysis of the origins of this increment must await the collection and analysis of refractive index data of improved accuracy over a much wider frequency range than has so far been investigated; but in the meantime we point out that the application of the Kramers–Kronig relationship to absorption data alone, can be confusing. The integrated negative second moment of the power absorption coefficient contributes proportionally not to v−2 but to v−1, so that a shift of the absorption band by a factor of 229:170 alters its contribution to n2, not by 235% but by 83%. Further, the maximum of the liquid water band taken to be at 170 cm−1 is now placed as high as 200 cm−1 (ref. 4).
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HASTED, ZAFAR & CHAMBERLAIN The origin of the far-infrared polarisation of liquid water (Reply). Nature 251, 218 (1974). https://doi.org/10.1038/251218a0
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DOI: https://doi.org/10.1038/251218a0
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