Reaction Rate Constant forNe++ 2Ne→Ne2++ Ne

The time dependence of the ${\mathrm{Ne}}^{+}$ ion density was measured during the decay period of plasmas produced in neon for reduced gas pressures varying from 0.33 to 7.6 Torr and a gas temperature of 300 °K. The reaction rate constant for the termolecular ion-neutral association reaction ${\mathrm{Ne}}^{+}$ + 2Ne→${\mathrm{Ne}}_2^{+}$ + Ne was found to be $k=(4.4\mathrm{}\pm 0.4)\times {10}^{-32\mathrm{}}$ ${\mathrm{cm}}^6$ ${\sec }^{-1\mathrm{}}$. The value of the mobility of ${\mathrm{Ne}}^{+}$ in neon was confirmed to be $\mu \left({\mathrm{Ne}}^{+}\right)=(4.0\mathrm{}\pm 0.1)$ ${\mathrm{cm}}^2$ ${\sec }^{-1\mathrm{}}$. At gas pressures smaller than about 1.7 Torr the phenomenon of diffusion cooling was observed.