Atomic Physics and Related Subjects.: Communications to Nature.: Raman Effect in Liquefied Gases

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IN a recent investigation by Daure (Trans. Faraday Soc., 25, 825; 1929) on the Raman effect in liquefied gases, it was found that the spectrum of liquid ammonia includes three strong lines the displacements of which are 321, 330, and 338 mm.−1 Two of these lines (321 and 330 mm.−1) have already been observed by Dickinson, Dillon, and Rasetti (Phys. Rev., 34, 582; 1929), who found the line 330 to be very strong and the other slightly weaker. Now the Raman spectrum of ammonia vapour as reported by Wood (Phil. Mag., 7, 744; 1929) shows only the line 330 mm.-1, hence Daure ascribes the two new lines to some complex such as H3N = NH3. It seems to me that this observation is significant and worthy of more consideration.

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