HIGH-RESOLUTION STUDY OF THE H-2-]HD+D REACTION DYNAMICS AT A COLLISION ENERGY OF 2.2 EV(D)

The reactivity of H + D-2(v=0, j=0) --> HD(v',j') + D has been investi gated in a high resolution crossed molecular beam experiment at a coll ision energy of 2.2 eV. Time-of-flight (TOF) spectra of D atoms at dif ferent laboratory (LAB) scattering angles and their total angular dist ribution were measured using the technique of Rydberg atom TOF spectro scopy. The resolution of this technique allows the identification of i ndividual rovibrational states of the corresponding HD product molecul e at the different LAB angles. A detailed simulation of the experiment al measurements has been performed by using state resolved differentia l cross sections from quasiclassical trajectory (QCT) calculations on the Liu-Siegbahn-Truhlar-Horowitz (LSTH) and on the double-many-body-e xpansion (DMBE) potential energy surfaces (PES). A general good agreem ent between experiment and theory is found, although there are some di screpancies which are discussed.