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The Spectrum of Nitrogen Dioxide in the 1.4-3.4μ Region and the Vibrational and Rotational Constants of the NO_2 Molecule

Moore, Gordon E. (1953) The Spectrum of Nitrogen Dioxide in the 1.4-3.4μ Region and the Vibrational and Rotational Constants of the NO_2 Molecule. Journal of the Optical Society of America, 43 (11). pp. 1045-1050. ISSN 0030-3941. doi:10.1364/JOSA.43.001045.

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The infrared spectrum of NO_2 has been reinvestigated in the 1.4–3.4μ region under high dispersion. The nine bands observed show resolvable rotational structure and the moments of inertia obtained, in conjunction with the large rotational constant from measurements of ν_2 by Wilson and Brown, yield the ground state parameters r_(N–O) = 1.188±0.004A and ∢O—N—O = 134° 4′±15′. The set of overtones and combinations observed together with ν_2 = 750.9 cm^(−1) from Wilson and Brown allow one to determine a complete set of quadratic vibrational interaction constants. The fundamental frequencies of NO_2 are ν_1 = 1322.5 cm^(−1), ν_2 = 750.9 cm^(−1), and ν_3 = 1616.0 cm^(−1). An intensity alternation is observed in type A bands as is predicted by theory but which, as far as the authors are aware, has not previously been observed in a similar case. An apparently abnormal interaction, which is not adequately explained, occurs between the vibrational levels 3_(ν_3) and 2_(ν_1) + 3_(ν_2) and likewise between ν_1 + 3_(ν_3) and 3_(ν_1) + 3_(ν_2).

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Additional Information:© 1953 Optical Society of America. (Received July 3, 1953) The author is happy to acknowledge his indebtedness to Professor R. M. Badger, who suggested the problem and contributed very helpful advice throughout the investigation and preparation of the manuscript. E. I. du Pont de Nemours Postgraduate Fellow, 1952-1953
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E. I. DuPont de Nemours and Company, Inc.UNSPECIFIED
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Caltech Gates and Crellin Laboratories of Chemistry1826
Issue or Number:11
Record Number:CaltechAUTHORS:20151110-112450276
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Official Citation:Gordon E. Moore, "The Spectrum of Nitrogen Dioxide in the 1.4–3.4μ Region and the Vibrational and Rotational Constants of the NO2 Molecule," J. Opt. Soc. Am. 43, 1045-1050 (1953)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62029
Deposited By: George Porter
Deposited On:10 Nov 2015 22:12
Last Modified:10 Nov 2021 22:57

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