Rovibrational line-shape parameters for H2 in He and new H2-He potential energy surface

•New H2-He potential energy surface.•Close-coupling values of pressure broadening and shifting coefficients.•Close-coupling values of Dicke parameters.•Data for isotropic and anisotropic (or electric quadrupole) Q (j = 0-5) lines for the fundamental and first four overtones.•Application of the generalized Hess method.

We report a new H2-He potential energy surface that, with respect to the previous one [Bakr et al.(2013)], covers much larger range of H2 stretching and exhibits more accurate asymptotic behavior for large separations between H2 and He. Close-coupling calculations performed on this improved potential energy surface allow us to provide line shape parameters for H2 between 5 and 2000 K for Raman isotropic Q lines and anisotropic Q lines (or electric quadrupole lines) and for vibrational bands from the ground up to v=5 and rotational quantum numbers up to j=5. The parameters provided include the usual pressure -broadening and -shifting coefficients as well as the real and imaginary part of Dicke contribution to the Hess profile. The latter parameters can be readily implemented in other line-shape profiles like the most recent one of Hartmann and Tran.

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