High-Pressure Study of Ion-Molecule Reactions in the Mixture of Carbon Tetrafluoride and Argon

Charge-exchange ion-molecule reactions of $Ar^+$ ions with $CF_4$ have been studied in the pressure range 1.33-39.99 Pa. A quadrupole mass spectrometer with a high-pressure ion source has been used for measuring gaseous ion-molecule reactions in the mixture of 1% $CF_4$ and 99% Ar. The fractional abundance $I_i//\sum I_i$ of the observed $CF_3^+$, $CF_2^+$ and argon ions has been determined as a function of the gas mixture pressure (at the values of the repeller electrode potentials $V_{R}$ ranging from 2 to 10 V).