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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;r-centroids;Astronomical spectra;Potential energy curves
Issue Date: Apr-2005
Publisher: CSIR
IPC Code: G01J3/28
Abstract: The potential energy curves for the different electronic states of molecules like N2+, N2, OH and S2 observed in comets are constructed by using the Rydberg–Klein–Rees method as modified by Vanderslice et al. 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 N2+, N2, OH and S2 respectively. These values are in good agreement with the literature values. The r-centroids and Franck-Condon factors (FC factors) for the band system of A–X system of N2+ and A–X and B–X system of N2 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.
Page(s): 237-245
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.43(04) [April 2005]

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