Relative dissociation fractions of CF4 under 15–30 keV H−, C− and O− negative ion impact

Abstract

The relative dissociation fractions to produce the fragments of CF4 molecule are studied under the impact of 15 keV to 30 keV H−, C− and O− negative ions. By using a time-of-flight mass spectrometer, the recoil ions and ion pairs originating from the target molecule CF4 are detected and identified in coincidence with scattered ions in q = 0 and q = +1 charge states. The fractions for the production of the fragment ions are obtained relative to the yield, while that of the ion pairs relative to the (C+, F+) coincidence yield.