Vibrational deactivation of F2(ν=1,j=0) by 1H at very low energy

We present close coupling calculations of the vibrational quenching cross-sections and rate constants for the F2(ν=1,j=0) molecule colliding with 1H atoms. The open-shell van der Waals complex H-F2 is studied using the internally contracted multireference configuration interaction method and an extensive basis set. The potential energy surface describing the H-F2 complex is obtained by fitting the ab initio points using the reproducing kernel Hilbert space method (RKHS). As for the closed shell He-F2 complex, we find that this surface exhibits two minima, the well associated with the linear intermediate being deeper than the one associated with the T-shape one. The quenching cross-section exhibits an unusual peak at very low energy which we suggest to be due to the presence of the reactive channel. The similarities and differences with the He-F2 system are also discussed