FRANCK-CONDON FACTORS FOR THE IONIZATION OF AMMONIA
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Date
1971
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Publisher
Ohio State University
Abstract
Franck-Condon factors for the transition from the ground state of ammonia to the $^{2}$A^{\prime\prime} ionic state have been calculated. Calculations were made using and anharmonic potential function for the inversion mode of vibration of both the ground and ionized states. In addition, calculations were made in which all vibrations were assumed to be harmonie. The results of these calculations were compared with the relative intensities for this transition observed in the photoelectron spectrum of $NH_{3}$ and $ND_{3}$ reported by Branton, et. al. and Weiss and $Lawrence^{2}$. This comparison indicates that in the $^{2}$A,^{\prime\prime} state the ion has a planar configuration. The symmetric stretching mode of vibration of the ion, with a frequency of 2900 $\pm$ $100 cm^{-1}$ for $NH_{3}^{+}$, is excited in the transition, as well as the inversion mode of vibration. The N-H bond length for the $^{2}A$,^{\prime\prime} state of the ion is determined to be 1.06 $\pm$ 0.01 \AA.
Description
$^{1}$G. R. Branton, D. C. Frost. F. G. Herring, C. A. McDowell and I. A. Stenhouse, Chem. Phys. Letters 3.581 (1969). $^{2}$M. J. Weiss and G. M. Lawrence. J. Chem. Phys. 53, 214 (1970).""
Author Institution: Chemistry Department, Carnegie-Mellon University
Author Institution: Chemistry Department, Carnegie-Mellon University