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Title: Spectroscopic studies of molecules observed in comets
Authors: Reddy, R R
Gopal, K Rama
Ahammed, Y Nazeer
Basha, D Baba
Narasimhulu, K
Reddy, L Siva Sankar
Keywords: Comets
Franck-Condon factors
<i style="">r</i>-centroids
Astronomical spectra
Potential energy curves
Issue Date: Apr-2005
Publisher: CSIR
Series/Report no.: G01J3/28
Abstract: The potential energy curves for the different electronic states of molecules like N<sub>2</sub><sup>+</sup>, N<sub>2</sub>, OH and S<sub>2 </sub>observed in comets are constructed by using the Rydberg–Klein–Rees method as modified by Vanderslice <i style="">et al</i>. The ground state dissociation energies are determined by curve fitting technique using the five parameter Hulburt-Hirschfelder (H-H) function. The estimated dissociation energies are 8.587±0.248, 9.620±0.275, 4.308±0.118 and 4.325 ±0.115 eV for N<sub>2</sub><sup>+</sup>, N<sub>2</sub>, OH and S<sub>2 </sub>respectively. These values are in good agreement with the literature values. The <i style="">r</i>-centroids and Franck-Condon factors (FC factors) for the band system of A–X system of N<sub>2</sub><sup>+</sup> and A–X and B–X system of N<sub>2</sub> molecules have been calculated employing approximate analytical methods of Jarmain and Fraser and Nicholls and Jarmain. The absence of the bands in these systems is explained.
Description: 237-245
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.43(04) [April 2005]

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