Fig. 8
Rotational populations of the lowest ortho levels of NH3 in the coma of comet 10P/Tempel 2 (rh = 1.431 AU, QH2O = 2.2 × 1028 mol s-1, vexp = 0.7 km s-1), taking into account collisions with neutrals at T = 25 K, collisions with electrons (responsible for the feature at the contact surface at ≈1000 km), radiative decay and infrared pumping.
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