Anomalous behaviour of methane in the Raman effect

Bhagavantam, S. (1932) Anomalous behaviour of methane in the Raman effect Nature, 130 . p. 740. ISSN 0028-0836

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Dickinson, Dillon and Rasetti,1 who examined the Raman spectrum of methane, did not report the presence in it of any pure rotational lines accompanying the Rayleigh scattering. To decide whether indeed the rotational scattering is absent in the case of this gas, spectrograms were obtained by giving prolonged exposures up to a week, but without recording even a trace of such scattering by way of either discrete lines or unresolved bands alongside the undisplaced lines of the mercury spectrum. Special devices for eliminating stray light and weakening the Rayleigh scattering with the aid of a nicol were employed in order to secure the most favourable conditions for the observation, but these made no difference to the result stated.

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