Full-dimensional quantum mechanical study of ^{3}He+^{3}He+X^{−} → ^{3}He+^{3}HeX^{−}(X=HorD)

Abstract

The atom-atom-anion three-body recombination (TBR) of ^{3}He+^{3}He+X^{−}(X=HorD) systems at ultracold temperatures (T=0.01∼100 mK) are studied by solving the Schrödinger equation in the adiabatic hyperspherical representation. It is found that for each system, ^{3}He+^{3}He+H^{−} or ^{3}He+^{3}He+D^{−}, the J^{Π}=1^{−} symmetry dominates the TBR process, and the rates of TBR into l=1^{3}HeX^{−} molecular anions are roughly three times as large as than that into l=0^{3}HeX^{−} molecular anions for T∈[0.01,10] mK, where l denotes the two-body rotational quantum number. In addition, for a given product state, the TBR rates of the ^{3}He+^{3}He+H^{−} system are larger than that of the ^{3}He+^{3}He+D^{−} system by roughly two orders of magnitude which could be ascribed to the major nonadiabatic couplings between the entrance and recombination channels.