High resolution study of the Ångström band system of the ¹³C¹⁸O molecule

Prasad, Chintalapati V. V. (1983) High resolution study of the Ångström band system of the ¹³C¹⁸O molecule. Masters thesis, Memorial University of Newfoundland.

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Abstract

A hollow cathode discharge tube of special design whose cathode portion can be conveniently cooled with liquid nitrogen during the operation of the discharge was constructed. Initial experiments have shown that the cathode glow is an excellent source to obtain the electronic band spectra of several ionic diatomic molecules and that the anode glow is a convenient source to obtain certain selective diatomic band systems of numerous neutral diatomic molecules. -- The Β¹Σ⁺ - Α¹Π Ångström band system of the ¹³C¹⁸O molecule consisting of eight bands In the region 4100 - 6500 Å was photographed under the medium dispersion of a 2 m Bausch and Lomb dual grating spectrograph in the first order of a 600 grooves/mm grating as well as under the high resolutions of this instrument and a 3.4 m Jarrell - Ash Ebert grating spectrograph, in each case, in the second and third orders of a 1200 grooves/mm grating. -- Detailed rotational analysis has been carried out for the first time for the 1-0, 1- 1, 0-1, 0-2, 0-3, 0-4, and 0-5 bands except for the complex 0-0 band. Rotational constants for both Α¹Π and Β¹Σ⁺ states as well as the origins of these bands have been derived from the analysis. Vibrational constants for the two states are also obtained from the band origins. -- Perturbations observed in the vibrational levels v = 0, 3, and 5 of the Α¹Π state have been analyzed in detail. It is found that the v = 0 level of the Α state is perturbed by the v = 1 level of the e³Σ⁻ state and its v = 3 and 5 levels are perturbed by the v = 13 and 16 levels of the a’³Σ⁺, respectively.

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