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

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 ${\text{CF}}_3^{+}$ yield, while that of the ion pairs relative to the (C⁺, F⁺) coincidence yield. (paper)