LASER-INDUCED FLUORESCENCE EXCITATION SPECTROSCOPY OF HIGHLY VIBRATIONALLY EXCITED $\bar{A}^{2}A_{1}$ $NH_{2}$ RADICAL
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Date
1995
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
Eighty spin-rovibronic transitions in $NH_{2}\bar{A}^{2}A_{1} (0, 10, 0)^{Ka=1} \leftarrow \bar{X}^{2}B_{1} (0,0,0)^{Ka=0,2}$ and $\bar{A}^{2}A_{1} (0, 12, 0)^{Ka=0} \leftarrow \bar{X}^{2}B_{1} (0, 2, 0)^{Ka=1}$ have been observed in the range of $28810-29220 cm^{-1}$. The spectral resolution $(\Delta\nu \sim 0.03 cm^{-1})$ of the present investigation has resolved many electron-spin doublets. The observed high-lying $\Pi(0, 10, 0)$ and $\Sigma(0, 12, 0)$ vibrational states of $NH_{2}\bar{A}^{2}A_{1}$ were only subjected to minor perturbations, despite the molecule undergoing a large-amplitude bending vibration. The molecular constants, $T = 29036.13(7)cm^{-1}, B = 9.671(6)cm^{-1}, A = 0.93(25)cm^{-1} and q = 2.25(1)cm^{-1}, of NH_{2} \bar{A} {^{2}A_{1}} \Pi(0, 10, 0)$ have been obtained from a least-squares fit to the spectroscopically determined spin-rovibronic term values. The spectroscopic constants of $NH_{2}\bar{A}{^{2}}A_{1} \Sigma(0, 12, 0), T = 32115.9(14)cm^{-1}$ and $B = 10.33(18)cm^{-1}$, have also been determined from the present data. From the distinct power broadenings, the vibronic transition dipole moment of $\bar{A}{^{2}}A_{1} (0, 12, 0)^{Ka=0} \leftarrow \bar{X}{^{2}}B_{1} (0, 2, 0)^{ka=1}$ has been concluded to be much larger than that of $\bar{A}{^{2}}A_{1} (0, 10, 0)^{Ka=1} \leftarrow \bar{X}{^{2}}B_{1} (0, 0, 0)^{Ka=0,2}$
Description
Author Institution: National Taiwan University, Taipei 106, Taiwan; Academia Sinica, P.O. Box 23-166, Taipei 106, Taiwan