Abstract
The physical conditions of celestial objects can be analyzed using the spectrum of atoms or molecules present in the object. The present work focuses on the spectroscopic analysis of astrophysically significant molecule AlF. The evaluation of Franck-Condon (FC) factors andr-centroids is done by a numerical integration procedure using the suitable potential energy curves forC1Σ+-A1Σ+,b3Σ+-a3Πr,c3Σ-a3Πr, andf3Π-a3Πrband systems of AlF molecule. The intensity of various bands is discussed with the help of derived FC factors. The band degradation and the nature of potential energy curves are studied usingr-centroid values. The vibrational temperature of sunspot is estimated to be around 1220 ± 130 K which falls in the reported temperature range of cold sunspots.
Highlights
The existence of AlF molecule in various astrophysical sources has been confirmed by various researchers
In the case of the b − a band systems of the AlF molecule, the FC factors indicate that the Δ] = 0 sequence bands are more intense and all other bands are relatively weak
The FC factors of c−a and f−a band systems indicate that the Δ] = 0 sequence bands are significantly intense followed by the Δ] = ±1 sequence bands
Summary
The existence of AlF molecule in various astrophysical sources has been confirmed by various researchers. Examined sunspots spectra towards the identification of various diatomic molecules and found 100 lines of AlF molecule. Bagare et al [8] made an extensive search for AlF molecular lines in the spectra of sunspots and confirmed their presence. With the help of vibronic transition probability parameters such as Franck-Condon (FC) factors, r-centroids, relative intensities, oscillator strength, and vibrational temperature of diatomic molecular species, the spectroscopic technique could be very useful in the identification of molecular lines and in the estimation of relative abundance of the species in astrophysical sources. The literature on the reports of Franck-Condon factors and r-centroids for the b3Σ+ − a3Πr, c3Σ − a3Πr and f3Π − a3Πr band systems of AlF molecule is not made. 1.444 the complete array of the FC factors and r-centroids using experimental vibrational levels and vibrational temperature of the source using relative intensity of the bands
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