Stereodynamic control of nonadiabatic processes in low-energy Be+(2P) + H2 (v=0, j=2) collisions

Controlling the relative arrangement of colliding molecules is crucial for determining the dynamical outcomes of chemical processes and has emerged as a hot spot of experimental research. Here, the quantum scattering calculations are conducted to investigate the stereodynamic control in collisions between Be+(P-2) and H-2 (v = 0, j = 2), which undergo nonadiabatic transitions to the electronic ground state. Stereodynamic preparation is achieved by controlling the initial alignment of the H-2 bond axis relative to the scattering frame. For product BeH+ in the reactive process, the differential cross sections (DCSs) are significantly enhanced in the forward and sideways hemispheres when the alignment angle beta is 60 degrees. For the product H-2 in the quenching channel, the beta = 0 degrees preparation can result in a more than one-fold increase in the DCS at a polar scattering angle of 0 degrees. Furthermore, varying the alignment angle beta also has noteworthy effects on the rotational-state distributions of BeH+ products. Specifically, beta = 0 degrees preparation can induce the disappearance of the bimodal distribution of rotational states at a collision energy of 0.05 eV.