COLLINEAR (HE,HD- TRANSITION-STATE RESONANCES AND DYNAMICS BY TIME-DEPENDENT QUANTAL WAVE-PACKET APPROACH() AND (HE,DH+) COLLISIONS )

We examine the possibility of existence of dynamical resonances in col linear (He,HD+) and (He,DH+) collisions by analyzing their respective transition state spectra on the McLaughlin-Thompson-Joseph-Sathyamurth y potential energy surface (PES). The spectra are computed by Fourier transforming the temporal autocorrelation function, C(t), of the initi al wave packet. Some of the well resolved resonances are analyzed by c omputing their eigenfunctions and lifetimes. The vibrational state (v) - selected energy resolved reaction probabilities (P-v(R)(E)) for col linear (He,HD+) and (He,DH+) collisions are also calculated on the sam e PES by computing the reactive flux in the product channel. The P-v(R )(E) values for HeHD+ show a characteristic staircase-like structure t hat can be related to threshold resonances. The P-v(R)(E) values for H eDH+ on the other hand, are highly oscillatory, in keeping with the de nsely packed transition state spectrum.