Full-dimensional quantum dynamics of water in collisions with H*

Modeling of molecular emission spectra from the interstellar medium requires the

calculation of rate coefficients for excitation by collisions with abundant species.

Water is an abundant molecule in a variety of astrophysical environments,

and has been the focus of countless theoretical astrophysical studies and observations.

In this work we report full-dimensional state-to-state and total quenching cross sections

and rate coefficients from some selected rotational J K_a,K_c states in vibrational states of

(v₁,v₂,v₃)=(010) and (100) for both para- and ortho-H₂O in collisions with H,

v₁, v₂,  v₃  are quantum numbers for the fundamental vibrational modes of water.

The high level ab initio potential energy surface (PES)

used in the scattering calculations were fitted using a two-component invariant polynomial method.

Our total vibrational quenching cross sections

are also compared with the results of Cabrera-Gonzalez et al., which were calculated on

a 4D PES with the  Rigid-bender close-coupling method.