Abstract
NH/sub 3/ and ND/sub 3/ were photolyzed with an ArF (193 nm) excimer laser. Besides weak emission from ND(b/sup 1/..sigma../sup +/), strong fluorescence emission from NH(A/sup 3/PI) were observed in the investigated wavelength region 130-500 nm. Measurements of the fluorescence intensity and rotationally resolved spectra indicate a two-photon resonance process. In this dissociation process rotationally hot NH (ND) in the A/sup 3/PI state is generated with almost no translational energy left for either detached H atom. The dynamics of the photodissociation is discussed. Lifetime measurements of the excited A/sup 3/PI states indicate (a) a slight isotope effect and (b) longer zero-pressure lifetimes than previously recommended.
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