Nonadiabatic Ultracold Quantum Reactive Scattering of Hydrogen with Vibrationally Excited HD( = 5-9).

The results from electronically non-adiabatic and adiabatic quantum reactive scattering calculations are presented for the H + HD( = 5-9) → H + HD(', ') reaction at ultracold collision energies from 10 nK to 60 K. Several experimentally verifiable signatures of the geometric phase are reported in the total and vibrationally and rotationally resolved rate coefficients. Most notable is the predicted 2 orders of magnitude enhancement of the rotationally resolved ultracold rates of odd symmetry relative to those of even symmetry. Prominent shape resonances appear at higher collision energies (100 mK to 20 K), which could be measured experimentally. Significant geometric phase effects are also reported on the resonance energies and lifetimes. In particular, an enhancement (suppression) of the = 1 ( = 2) shape resonances for HD( = 5, 6) is predicted for even symmetry relative to those of odd symmetry.