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We present quantum close-coupling calculations for the rotational excitation of the interstellar amidogen radical NH due to collisions with H molecules. The calculations are based on a recent, high-accuracy full-dimensional NH potential energy surface adapted for rigid-rotor scattering calculations. The collisional cross section calculations are performed for all transitions among the first 15 energy levels of both ortho- and para-NH and for total energies up to 1500 cm. Both para- and ortho-H colliding partners are considered. The cross sections for collision with para- and ortho-H are found to differ significantly, the magnitude of the ortho-H ones being dominant. No strong propensity rules are observed but transitions with Δk=0 are slightly favored.

Rotational excitation of the interstellar NH2 radical by H2