Nitrogen Molecular Spectra in the Vacuum Ultraviolet

William W. Watson; Philip G. Koontz

doi:10.1103/PhysRev.46.32

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Nitrogen Molecular Spectra in the Vacuum Ultraviolet

William W. Watson and Philip G. Koontz

Yale University

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Phys. Rev. 46, 32 – Published 1 July, 1934

DOI: https://doi.org/10.1103/PhysRev.46.32

Abstract

Nitrogen molecular spectra in the region from 900A to 2300A have been photographed with a 10-foot vacuum spectrograph giving a dispersion of 5.5A/mm. Partial rotational quantum analyses have been made for several bands of the $a {}^{1}Π_{u} \to {}^{1}Σ_{g}^{+}$ system yielding the constants ${B_{0}}^{'} = 1.632 \pm 0.002$ , ${B_{0}}^{''} = 1.998 \pm 0.002$ , $α^{'} = 0.021$ , $α^{''} = 0.018$ . Many new bands in a nitrogen band system with an origin at 1847A discovered by Hopfield in a condensed discharge in a helium-nitrogen mixture are reported. This system is due to $N_{2}^{+}$ , having the same lower state as that of the first negative system. The rôle of the helium is discussed. Birge and Hopfield's $b^{'}$ progression is found to consist of $Q$ branches only with $B^{'} = 1.147$ . Several new $N_{2}$ ground state progressions among the bands in the 900A-1300A interval are presented.

References (13)

R. T. Birge and J. J. Hopfield, Astrophys. J. 68, 257 (1928)
E. T. S. Appleyard, Phys. Rev. 41, 254 (1932)
F. Rasetti, Phys. Rev. 34, 367 (1929)
J. J. Hopfield, Phys. Rev. 36, 789 (1930)
R. A. Sawyer, J. O. S. A. and R. S. I. 15, 305 (1927)
J. J. Hopfield and E. T. S. Appleyard, J. O. S. A. 22, 488 (1932)
D. Coster and H. H. Brons, Zeits. f. Physik 73, 747 (1932)
J. Kaplan kindly informed us in a private communication
W. W. Lozier, Phys. Rev. 44, 575 (1933)
R. deL. Kronig, Zeits. f. Physik 62, 300 (1930)
J. Kaplan, Phys. Rev. 42, 97 (1932)
J. Kaplan, Phys. Rev. 45, 675 (1934)
W. W. Lozier, Phys. Rev. 45, 840 (1934)

[c1] R. T. Birge and J. J. Hopfield, Astrophys. J. 68, 257 (1928)

[c2] E. T. S. Appleyard, Phys. Rev. 41, 254 (1932)

[c3] F. Rasetti, Phys. Rev. 34, 367 (1929)

[c4] J. J. Hopfield, Phys. Rev. 36, 789 (1930)

[c5] R. A. Sawyer, J. O. S. A. and R. S. I. 15, 305 (1927)

[c6] J. J. Hopfield and E. T. S. Appleyard, J. O. S. A. 22, 488 (1932)

[c7] D. Coster and H. H. Brons, Zeits. f. Physik 73, 747 (1932)

[c8] J. Kaplan kindly informed us in a private communication

[c9] W. W. Lozier, Phys. Rev. 44, 575 (1933)

[c10] R. deL. Kronig, Zeits. f. Physik 62, 300 (1930)

[c11] J. Kaplan, Phys. Rev. 42, 97 (1932)

[c12] J. Kaplan, Phys. Rev. 45, 675 (1934)

[c13] W. W. Lozier, Phys. Rev. 45, 840 (1934)

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Nitrogen Molecular Spectra in the Vacuum Ultraviolet

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