Experimental Measurement of the ${\hbox{Ne}}^{+}$ and ${\hbox{Ne}}_{2}^{+}$ Mobilities in Ne and the Reaction Rate Coefficient for ${\hbox{Ne}}^{+} + 2{\hbox{Ne}} \ura{} {\hbox{Ne}}_{2}^{+} +{\hbox{Ne}}$

We measured the reduced mobilities of the atomic, Ne
⁺
, and dimer, Ne
₂
⁺
, ions in Ne, under different pressures and reduced electric fields, at 300 K. Extrapolation to zero field yields values of 4.4 cm
²
V
^-1
s
^-1
for Ne
⁺
and 6.2 cm
²
V
^-1
s
^-1
for Ne
₂
⁺
, which are in relative good agreement with other published data. The Ne
⁺
ions are converted to Ne
₂
⁺
by a three-body reaction with a rate constant that was also measured. Its average value for reduced electric fields in the 8 to 12 Td range was (5.6 ± 0.1) × 10
^-32
cm
⁶
s
^-1
at 300 K, also agreeing with the results from other authors using other techniques.