Electron attachment to fluorocarbon radicals

摘要

Thermal electron attachment rate constants for a series of small fluorocarbon radicals (CF_2, C_2F_3, 1-C _3F_7, 2-C_3F_7, C_3F _5, CF_3O) were measured from 300 to 600 K using the variable electron and neutral density attachment mass spectrometry method. With the exception of CF_2, for which no attachment was observed, all species exclusively underwent dissociative attachment to yield F~-. The magnitude and temperature dependences of the rate constants varied significantly between species; however, attachment was in all cases inefficient, never exceeding 2 of the calculated collisional value. The data are interpreted and extrapolated to conditions inaccessible to the experiment using a kinetic modeling approach to the electron attachment process.