Interstellar Nitrogen Monohydride - Chemistry

Chemistry

Chemical reactions
Reaction Rate Constant Rate/2
N + H- → NH + e- 1x10−9 3.5x10−18
NH2 + O → NH + OH 2.546x10−13 1.4x10−13
NH2+ + e- → NH + H 3.976x10−7 2.19x10−21
NH3+ + e- → NH + H + H 8.49x10−7 2.89x10−19
NH + N → N2 + H 4.98x10−11 4.36x10−16
NH + O → OH + N 1.16x10−11 1.54x10−14
NH + C+ → CN+ + H 7.8x10−10 4.9x10−19
NH + H3+ → NH2+ + H2 1.3x10−9 3.18x10−19
NH + H+ → NH+ + H 2.1x10−9 4.05x10−20

Within diffuse clouds H- + N → NH + e- is a major formation mechanism. Near chemical equilibrium important NH formation mechanisms are recombinations of NH2+ and NH3+ ions with electrons. Depending on the radiation field in the diffuse cloud, NH2 can also contribute.

NH is destroyed in diffuse clouds by photodissociation and photionization. In dense clouds NH is destroyed by reactions with atomic Oxygen and Nitrogen. O+ and N+ form OH and NH in diffuse clouds. NH is involved in creating N2, OH, H, CN+, CH, N, NH2+,NH+ for the interstellar medium.

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