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Absorption Bands of Hydrogen Cyanide Gas in the Near Infrared

Badger, Richard M. and Binder, John L. (1931) Absorption Bands of Hydrogen Cyanide Gas in the Near Infrared. Physical Review, 37 (7). pp. 800-807. ISSN 0031-899X. doi:10.1103/PhysRev.37.800.

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The absorption spectrum of gaseous hydrogen cyanide has been investigated by photographic methods in the region λ7000-9200. Two weak bands of very simple structure were found, having P and R branches but no Q branches. The band at λ7912 is apparently a harmonic of a fundamental band at 3.04μ, and the very weak band at λ8563 is a combination band. The hydrogen cyanide molecule is linear in the normal state, and has a moment of inertia I=18.79×10^-40 g·cm^2. The distance of separation of the carbon and nitrogen atoms is estimated to be 1.15×10^-8 cm. Hydrogen cyanide is discussed in regard to its three fundamental oscillations which have frequencies 3290, 2090, and 710, respectively, and in regard to its dissociation energy and dissociation products. The evidence requires a molecular structure represented by the formula HCN, and shows that the normal molecule is built from a normal hydrogen atom and a normal CN radical. The absorption of cyanogen gas has also been investigated in the photographic infrared, but no absorption bands could be detected.

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Additional Information:©1931 The American Physical Society. Received 20 February 1931.
Issue or Number:7
Record Number:CaltechAUTHORS:BADpr31a
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10479
Deposited By: Archive Administrator
Deposited On:08 May 2008
Last Modified:08 Nov 2021 21:08

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