Reaction of NH+, NH2+, and NH3+ ions with H2 at low temperatures - The pathway to ammonia production in the interstellar medium

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Fig. 7.

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Measured dependence of the reaction rate r_NH₂f of NH ions on H₂ number density. The helium number density is [He]∼1.1 × 10¹⁴ cm⁻³. The collisional temperatures are T = 18 K and 24 K. The corresponding values of the binary reaction rate coefficient are given by the slope of the plotted dependences. The primary NH ions were produced in the SIS and injected into the ion trap.

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