A TIME-DEPENDENT STUDY OF THE FLUORESCENCE-SPECTRUM OF AMMONIA

We present the first A approximately - X approximately emission spectrum for upsilon' = 0 in ammonia. We use time-dependent quantum mechanical calculations of the emission spectrum of NH3 from upsilon' = 0 of the A approximately state as a tool to investigate the minimum of the A approximately state potential energy surface. We use the emission spectrum as a test of the A approximately state surface that we generated in an earlier study of the absorption spectrum. Comparison of the experimental emission spectrum with that calculated by using our modified A approximately state shows that the equilibrium bond length for the A approximately state is almost-equal-to 1.08 angstrom. We also show that various layers of resolution of the emission spectrum tell us about different regions on the ground-state potential energy surface.