15min:
AMMONIA CLUSTER DISSOCIATION VIA NH STRETCH EXCITATION.

AMANDA S. CASE, CORNELIA G. HEID AND F. FLEMING CRIM, The University of Wisconsin-Madison, Department of Chemistry, 1101 University Avenue, Madison, WI 53706.

Ammonia clusters were formed in a supersonic expansion and interrogated with IR light in the NH stretching region. The ammonia molecules resulting from vibrational predissociation were detected using (2+1) resonance enhanced multiphoton ionization (REMPI) through the B state. By monitoring various rotational levels of ammonia, we have also obtained an IR spectrum for the multiple clusters formed in our molecular beam.