Ion-molecule reaction in pure H2S

The results of investigation of ion-molecule reaction in pure hydrogen sulfide are presented. Measurements were performed by means of quadrupole mass spectrometer with a high-pressure ion source. The primary ions S+, HS+, H2S+ were formed as the result of ionization and dissociative ionization of neutral H2S by electrons with energy 300 eV. They react with neutral hydrogen sulfide to form secondary ions H3S+, S2+, H2S2+, H5S2+ and H2S3+. Small amounts of H334S2+ were also observed. Relative ion currents for the observed ions were determined as a function of total H2S pressure inside the ion source collision chamber. The reaction rate constants for S+, HS+ and H2S+ were determined.