The β- and γ-band systems of 14NS and 15NS

Narasimham, N. A. ; Srikameswaran, K. (1962) The β- and γ-band systems of 14NS and 15NS Proceedings of the Indian Academy of Sciences, Section A, 56 (6). pp. 316-324. ISSN 0370-0089

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The spectra of 14NS and 15NS molecules are obtained in a 2450 mc./s. microwave oscillator discharge. Vibrational assignments of the β- and γ-systems are studied in more detail. Several hitherto unrecorded bands are satisfactorily explained as belonging to higher v', v" levels in the Deslandres schemes of both β- and γ-systems. The observed isotope shifts (14NS-15NS) provide confirmatory evidence for the proposed vibrational analysis. In the case of the γ-system, the v'=2 level of the upper state appears to be strongly perturbed showing a shift of about 38 cm.−1 from the expected position. In the β-system, the isotopic shifts in the band-heads involving the v'=0 and 1 levels of the 2Δ5/2 of the upper state show small deviations from expected values. The reality of these small deviations is established beyond doubt by the occurrence of the effect on the 0–0 sub-band which exhibits the isotopic head in a wavelength direction opposite to the expected one.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
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Deposited On:31 Mar 2011 09:03
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