Abstract

The rotational constant B000″ for HCN has been measured using the 004 and 103 infrared rotation-vibration bands. A Fabry-Perot etalon was crossed on a high resolution plane grating spectrograph, used in conjunction with a multiple reflection absorption tube. The value of B000″ obtained is 1.47830±0.00002 cm−1. This same constant has been measured in pure frequency units in the microwave region by Nethercot, Klein, and Townes. Their value for the constant is 44,315.9±0.25 mc/sec. The ratio of these two values gives directly the velocity of light in vacuum. The value so obtained is c=299,776±6 km/sec. The procedure used for precision determination of molecular constants, which makes complete use of experimental data, is described.

© 1952 Optical Society of America

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