N. Sreedhara Murthy

Dissociation energy for the ground state of AlO from true potential energy curve

Abstract The true potential energy curve for the ground state of AlO has been extended up to the observed vibrational levels v = 22 using revised vibrational constants. The dissociation energy for the ground state of AlO has been estimated to be 4.15 ± 0.05 eV by the method of curve fitting. The Lippincott potential function has been used for fitting with the RKRV curve.

Intensity measurements and relative band strengths of the fluorescent bands of the (B-X) system of I2

Relative integrated intensities of a few bands in the vibrational structure of the B-X fluorescent system of molecular iodine have been measured by the technique of photographic photometry. Reliable values of Franck-Condon factors and r-centroids given recently by Tellinghuisen have been employed to evaluate the variation of electronic transition moment with internuclear separation. The variation is found to be Re(r) = const.(1−0.6930r + 0.1201r2) in the range 2.76 < r < 2.81 A. Smoothed arrays of band strengths are presented for the bands. The effective vibrational temperature of the source is found to be 340 ± 55 K.

Dissociation energy of the ground states of SrO, SnCl, NaH, and RbH from the true potential energy curves

Abstract The RKRV turning points for the ground states of SrO, SnCl, NaH, and RbH have been calculated. The dissociation energies of the ground states have been obtained by curve fitting using an empirical potential function with the RKRV potential energy curves. The estimated values of the dissociation energies are 4.72±0.11, 2.9±0.13, 2.36±0.08, and 2.14±0.07 for SrO, SnCl, NaH, and RbH, respectively.

Carbon phosphide (B2 Σ + — A2 Π i) band system: RKR Franck-Condon factors andr-centroids

Franck-Condon factors andr-centroids based on Rydberg-Klein-Rees potential have been computed for the CP (B2Σ+ —A2Πi) band system. These results are compared with the Morse values and discussed.

True potential energy curve and dissociation energy of BeO

The true potential energy curve for the x1 Sigma + state of BeO has been calculated using the RKRV method. The dissociation energy of the ground state has been estimated to be 5.15+or-0.05 eV by the curve-fitting method using the three-parameter potential energy function of Lippincott (1961) with an RKRV potential energy curve.

Criterion for judging the influence of vibration-rotation interaction on Franck-Condon factors of diatomic molecules.

From a knowledge of the minima r0 of the effective potential of the two electronic states of a transition for a vibrating-rotating diatomic molecule having rotational quantum number J, together with a knowledge of the equilibrium internuclear distances, a criterion has been used to determine the influence of vibration-rotation interaction on Franck-Condon factors in the case of astrophysically important band systems.

Potential energy curves for theB 2 Σ andX 2 Σ states of scandium monoxide

For theB2Σ andX2Σ states of scandium monoxide, the potential energy curves are constructed by the Rydberg-Klein-Rees and the Morse methods. Morse model is shown to be adequate for the (B→X) band system of ScO. The re values are found to be 1.717 Å and 1.665 Å for theB andX states respectively.

Relative band strengths from the study of intensity distribution in the A-X system of CrO

Relative integrated intensities are measured for ten bands in the vibrational structure of the astrophysically significant A5π−X5π system of CrO by the technique of photographic photometry. Vibrational transition probabilities are computed using the revised molecular constants of the electronic states. Using these results, the variation of electronic transition moment with the internuclear separation is found to be Re(r) = const. × (1−0.398r) in the range 1.60 A < r < 1.72 A. A smoothed array of band strengths is presented.

Integrated intensity measurements and relative band strengths of CO (Ångstrom) bands

Relative integrated intensities of the bands of the (B1Σ+→A1π) system of carbon monoxide of astrophysical significance have been determined by the method of heterochromatic photographic photometry. A Morse model is used to calculate the Franck-Condon factors and r-centroids. The variation of the electronic transition moments Re(r) with the internuclear separation “r” is found to be Re(r)=const (1−1.748r+0.766r2). Accurate values of smoothed relative band strengths are presented.

The Franck-Condon factors and the r centroids of the yttrium oxide (B 2Σ-X 2Σ) band system

The calculation of the Franck-Condon factors of the bands of the yttrium oxide (B 2Σ-X 2Σ) system of astrophysical interest has been made by the method of numerical integration using Morse wave functions. The r centroids, previously unobtained for this band system, are evaluated by the same procedure and also by the graphical method.