Time-dependent wavepacket study of the collinear reaction He + H2+ → HeH+ + H

State-selected reaction probabilities for the collinear He + H2+(ν) → HeH+ + H have been computed for ν = 0−4 over a wide range of energies (to the dissociation limit), using the time-dependent wavepacket approach via time-energy mapping of the reactive flux. The results reproduce quantitatively the narrow reactive scattering resonances observed in earlier time-independent quantum mechanical results of Sakimoto and Onda [Chem. Phys. Letters 226 (1994) 227] thus demonstrating the viability and reliability of the method for such systems.