The Energy Transfer Dynamics of He(2(3)S(1)) and Ne(P-3(0,2)) with NH3

energy transfer reactions from he(2(3)s(1)) and ne(p-3(0,2)) to nh3 have been studied by observing emission spectra from excited fragments at crossed molecular beams. metastable rare gas atoms are generated by de. discharge in the molecular beams, nh(a-x,c-a,c-b), nh1 (b-x) and h*-balmer emission systems were observed in the he(2(3)s(1)) reaction, while only nh(a-x,c-a) was observed in the ne(p-3(0,2)) reaction. the absolute cross section of nh(a,c) from he(2(3)s(1)) was determined to be sigma=0.56 angstrom(2) by using the reference-reaction method. the nh(c) has a large propensity to populate f rotational level in he(2(3)s(1))+nh3 reaction, and this is considered to come from a two-step dissociation process. the propensity is opposite to that of nh3 photolysis at 121.6nm. the rotational excitation of nh(a,v-1) is somewhat higher than that of nh(a,v=0) and this may be the result of a large half-collision parameter according to the phase-space theory including angular momentum conservation. the to-vibrational population of nh(a) and the rotational population of nh(c) can be intepreted with a simple phase-space theory of three-body dissociation in the reacton of ne(p-3(0,2))+nh3.