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Fig. 9


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Hyperfine rate coefficients of NH (top) out of the (n1 = 4, j1 = 5, F1 = 5.5, F = 6.5) level and ND (bottom) out of the (n1 = 4, j1 = 5, F1 = 5, F = 6) level at 50 K as a function of the variation in the rotational angular momentum n1. The solid lines stand for para-H2 collisions and the dashed lines for ortho-H2 collisions. The ΔF1 = ΔF − 2 and Δn1 = Δ j1 − 2 transitions are represented by triangles, whereas the ΔF1 = ΔF − 1 and Δn1 = Δ j1 − 1 transitions are represented by squares.

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