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G. DUXBURY, Department of Physics, SUPA, John Anderson Building, University of Strathclyde, 107 Rottenrow, Glasgow G4 0NG, Scotland,UK; J. P. REID, School of Chemistry, University of Bristol, Bristol BS8 1TS.
A rotational and vibrational analysis has been made of the ND2 A 2A1-X2B1 emission spectrum produced from the ultraviolet laser induced dissociation of both jet cooled and room temperature deuterated ammonia, ND3, and di-deutero ammonia, ND2H. The pattern of the strong features in the emission spectra is very different in the fragmentation of ND3 and ND2H, with a much wider range of angular momentum states being observed from the photolysis of the predissociative state of the unsymmetrical parent ND2H. The analysis is based upon the earlier studies of the electronic spectrum of ND2, 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 ND3 and ND2H, and in the photolysis of ND2H strong emission from threshold states to three high energy regions of the X2B1 state. The threshold states are in the third bending level, v2'=3, of the ND2 A 2A1 state, and have no angular momentum about the axis of least moment of inertia, Ka = 0.