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Stateselected reactive scattering. II. He+H+ 2→HeH++H J. Chem. Phys. 95, 4894 (1991); 10.1063/1.461705 Collinear reactive scattering of stateselected H+ 2+He→HeH++H: A method for probing dynamical resonances J. Chem. Phys. 94, 8615 (1991); 10.1063/1.460718 Experimental and theoretical total stateselected and statetostate absolute cross sections. II. The Ar+(2 P 3/2,1/2)+H2 reaction J. Chem. Phys. 93, 4832 (1990); 10.1063/1.459671Effect of atomic spinorbit state on reactivity: Reaction of stateselected Ca(3 P 0 J ) with Cl2Cross sections for the reaction Ht + H2 ->H3+ + H, differential in scattering angle and recoil energy, are measured in a molecular-beam experiment at c.m. collision energies of 1.5, 2.3, 3.5, and 5.3 eV. Resonantly enhanced four-photon ionization prepares Ht in selected vibrationalstate distributions, allowing a systematic exploration of the effects of reactant energy on the product angular and energy distributions. Angular data are interpreted on the basis of competition between H3+ formation and collision-induced dissociation. The nominal atomtransfer (AT) and proton-transfer (PT) processes are identified respectively with forward and backward scattered H3+ . Effects of reactant energy on AT and PT cross sections in H 2 + + Hz are compared with previous observations on D/ + H2 and H/ + D 2 . The fraction of the available energy appearing as H3+ + H recoil ranges from 26% to 39% depending on reactant conditions. Previous surface-hopping trajectory calculations successfully predict most of the observed trends. Evidence is given for the existence oflong-lived Ht with internal energy in excess of the dissociation limit.

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