UGA Excitation Database

Atomic

Molecular

H2O

Theoretical rotational quenching cross sections and rate coefficients of ortho- and para-H2O due to collisions with He atoms are presented. The complete angular momentum close-coupling approach as well as the coupled-states approximation for angular momentum decoupling were applied to solve the scattering problem for a large range of rotationally-excited states of water. Results are obtained for quenching from initial levels 11,0, 21,2, 22,1, 30,3, 31,2, 32,1, 41,4, 33,0, and 42,3 of ortho-H2O and from initial levels 11,1, 20,2, 21,1, 22,0, 31,3, 32,2, 40,4, 41,3, and 33,1 of para-H2O for kinetic energies from 10-5 to 104 cm-1. State-to-state and total deexcitation cross sections and rate coefficients for temperatures between 0.1 and 3000 K are reported.

Reference:

Benhui Yang et al. 2013 ApJ 765 77.

Rate Coefficient Data

oH2O-He Lamda format.

pH2O-He Lamda format.

oH2O-He BaseCol format.

pH2O-He BaseCol format.

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