High pressure mass spectrometric study of ion/molecule reactions in the carbon dioxide–methane mixtures

Abstract

The results of an investigation of ion/molecule reactions in the gaseous mixtures of carbon dioxide–methane are presented. Relative values of the ion currents for the observed secondary ions HCO2+, HCO+, CH5+ were determined as a function of gas pressure in the ion source collision chamber, and concentration of carbon dioxide in the mixture. The concentration of carbon dioxide ranged from 10% to 90% with a 10% increment. The total pressures of the mixture changed from 0.7 to 26.6Pa. For the pressures higher than 14Pa, small amounts of HC2O4+ ions were also observed. The results for these ions are not presented here. Measurements were performed using mass spectrometer with the high pressure ion source (Int. J. Mass Spectrom. Ion Process. 154 (1996) 145; Ann Univ Mariae Curie-Skłodowska Sect. AAA 54 (1999) 73).