Ammonia Spectrum in the 1 cm. Wave-length Region

Details Ammonia Spectrum in the 1 cm. Wave-length Region Ammonia Spectrum in the 1 cm. Wave-length Region

Mar 1946

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1946natur.157r.339b&link_type=abstract

Nature, Volume 157, Issue 3985, pp. 339-340 (1946).

Computer Science

20

Scientific paper

IN 1933 Cleeton and Williams1 observed a broad absorption band in ammonia at atmospheric pressure in the region of 1 cm. wave-length ; this is attributed to the `inversion' of the pyramidal ammonia molecule which occurs when the nitrogen atom swings through the plane of the three hydrogen atoms. We have re-examined this phenomenon using a new technique, and have found that, as the pressure is reduced from 600 mm. mercury to 0.2 mm., so that the frequency of the collisions becomes small compared with the frequency of the radiation, an elaborate system of absorption lines appears.

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