High pressure investigations of ion – Molecule reactions in a mixture of C3H8 and Ne

The gas phase reactions of positive Ne+ ions produced from neon with neutral propane have been studied with the use of a quadrupole mass spectrometer with a high pressure ion source. The measurements were performed in a mixture of 1% C3H8 and 99% Ne in the pressure range 1.33–40.00 Pa. The fractional abundances Ii/ΣIi (relative intensity of the ion currents) of dominant C2H2+, C2H3+, C2H4+, C2H5+, C3H5+, C3H7+ ions and neon ions have been determined as a function of the gas mixture pressure and of the repeller electrode potential ranged from 3 V to 10 V.