Fig. 7.

Measured dependence of the reaction rate rNH2f 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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