SYMMETRY DEPENDENCE OF THE RO-VIBRONIC DISTRIBUTIONS OF THE ND$_{2}$ A$^{2}A_{1}$ FRAGMENTS FROM THE PHOTODISSOCIATION OF THE A STATES OF ND$_{3}$ AND ND$_{2}$H AT 193.3 NM
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Date
2011
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Ohio State University
Abstract
A rotational and vibrational analysis has been made of the ND$_{2}$ $\tilde{A} ^{2}A_{1}$-$\tilde{X}^{2}B_{1}$ emission spectrum produced from the ultraviolet laser induced dissociation of both jet cooled and room temperature deuterated ammonia, ND$_{3}$, and di-deutero ammonia, ND$_{2}$H. The pattern of the strong features in the emission spectra is very different in the fragmentation of ND$_{3}$ and ND$_{2}$H, with a much wider range of angular momentum states being observed from the photolysis of the predissociative state of the unsymmetrical parent ND$_{2}$H. The analysis is based upon the earlier studies of the electronic spectrum of ND$_{2}$, and model calculation based upon the stretch-bender Renner-Teller Hamiltonian. The spectra consist of two types, transitions from a narrow distribution of high angular momentum states in the photolysis of ND$_{3}$ and ND$_{2}$H, and in the photolysis of ND$_{2}$H strong emission from threshold states to three high energy regions of the $\tilde{X}^{2}B_{1}$ state. The threshold states are in the third bending level, v2$^\prime$=3, of the ND$_{2}$ $\tilde{A} ^{2}A_{1}$ state, and have no angular momentum about the axis of least moment of inertia, Ka = 0.
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Author Institution: Department of Physics, SUPA, John Anderson Building, University of Strathclyde, 107 Rottenrow, Glasgow G4 0NG, Scotland,UK; School of Chemistry, University of Bristol, Bristol BS8 1TS