10min:

J. XIN, Department of Physics and Engineering Technologies, Bloomsburg University, Bloomsburg, PA 17815; H. FAN, I. IONESCU, C. ANNESLEY AND S. A. REID, Department of Chemistry, Marquette University, Milwaukee, WI 53233.

The fluorescence excitation spectrum of the NH₂ ²A₁-²B₁ system has been measured in the region from 290 to 430 nm under jet-cooled conditions using a pulsed discharge source. A total of fourteen bands involving the pure bending states (0, ₂',0) were observed and analyzed, including ten bands not previously measured to our knowledge. The spectra are largely free from rotational perturbations at the low N values accessed in this experiment, and the molecular constants were obtained from a least squares fit to the determined spin-rovibronic term values. The derived constants are in good agreement with theoretical predictions incorporating the effects of orbital angular momentum on the spin-rotational fine structure.