The Microwave Absorption Spectrum of Nitrosyl Chloride NOCl

John D. Rogers; William J. Pietenpol; Dudley Williams

doi:10.1103/PhysRev.83.431

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The Microwave Absorption Spectrum of Nitrosyl Chloride NOCl

John D. Rogers, William J. Pietenpol, and Dudley Williams

Mendenhall Laboratory of Physics, Ohio State University, Columbus, Ohio

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Phys. Rev. 83, 431 – Published 15 July, 1951

DOI: https://doi.org/10.1103/PhysRev.83.431

Abstract

The absorption spectrum of nitrosyl chloride has been studied in the region between 21,000 and 23,000 mc/sec. Eight groups of closely spaced absorption lines have been observed; thirty-one individual lines have been resolved. The main features of the observed spectrum can be satisfactorily explained in terms of the rotational transition J = 1→2 for molecules in the ground and lowest excited vibrational state; the observed hyperfine-structure is satisfactorily explained in terms of nuclear quadrupole interactions involving the chlorine nuclei. The rotational constants for molecules in the ground vibrational state are: for NO ${Cl}^{35}$ , $A = 2.845$ , $B = 0.19141$ , and $C = 0.17934$ ${cm}^{- 1}$ ; for NO ${Cl}^{37}$ , $A = 2.854$ , $B = 0.18682$ , and $C = 0.17534$ ${cm}^{- 1}$ . Values for the quadrupole interaction terms are given. The ratio $\frac{Q^{35}}{Q^{37}}$ obtained in this study was 1.34±0.08.

References (14)

J. A. A. Ketelaar and K. J. Palmer, J. Am. Chem. Soc. 59, 2629 (1939)
W. J. Pietenpol and J. D. Rogers, "A recording Stark-effect-modulation spectrograph for the microwave region," Symposium on Molecular Structure (Ohio State University, June, 1949)
Rogers, Cox, and Braunschweiger, Rev. Sci. Instr. 21, 1014 (1950)
C. S. Wang, Phys. Rev. 34, 243 (1929)
H. H. Nielsen, Phys. Rev. 38, 1432 (1931)
Randall, Dennison, Ginsburg, and Weber, Phys. Rev. 52, 160 (1937)
C. M. Beeson and D. M. Yost [J. Chem. Phys. 7, 44 (1939)]
D. K. Coles and W. E. Good, Phys. Rev. 74, 533 (1948)
J. Bardeen and C. H. Townes, Phys. Rev. 73, 97 (1948)
G. Knight and B. T. Feld, Phys. Rev. 74, 354 (1948)
G. Knight and B. T. Feld, M.I.T. Technical Report, No. 123, (1949) (unpublished)
Geschwind, Gunther-Mohr, and Townes, Phys. Rev. 81, 288 (1951)
B. T. Darling and D. M. Dennison, Phys. Rev. 57, 128 (1940)
S. Golden and E. B. Wilson, J. Chem. Phys. 16, 669 (1948)

[c1] J. A. A. Ketelaar and K. J. Palmer, J. Am. Chem. Soc. 59, 2629 (1939)

[c2] W. J. Pietenpol and J. D. Rogers, "A recording Stark-effect-modulation spectrograph for the microwave region," Symposium on Molecular Structure (Ohio State University, June, 1949)

[c3] Rogers, Cox, and Braunschweiger, Rev. Sci. Instr. 21, 1014 (1950)

[c4] C. S. Wang, Phys. Rev. 34, 243 (1929)

[c5] H. H. Nielsen, Phys. Rev. 38, 1432 (1931)

[c6] Randall, Dennison, Ginsburg, and Weber, Phys. Rev. 52, 160 (1937)

[c7] C. M. Beeson and D. M. Yost [J. Chem. Phys. 7, 44 (1939)]

[c8] D. K. Coles and W. E. Good, Phys. Rev. 74, 533 (1948)

[c9] J. Bardeen and C. H. Townes, Phys. Rev. 73, 97 (1948)

[c10] G. Knight and B. T. Feld, Phys. Rev. 74, 354 (1948)

[c11] G. Knight and B. T. Feld, M.I.T. Technical Report, No. 123, (1949) (unpublished)

[c12] Geschwind, Gunther-Mohr, and Townes, Phys. Rev. 81, 288 (1951)

[c13] B. T. Darling and D. M. Dennison, Phys. Rev. 57, 128 (1940)

[c14] S. Golden and E. B. Wilson, J. Chem. Phys. 16, 669 (1948)

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The Microwave Absorption Spectrum of Nitrosyl Chloride NOCl

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