Electron attachment in dilute fluorine-helium mixtures

Abstract
We have made an absolute determination of the electron attachment coefficient η (cm−1) in helium containing 0.1–1% fluorine covering an E/N range from 3Td–17Td. At an estimated average energy of 5 eV we find a rate coefficient equal to (7.5±1.5) ×10−10 cm3/sec.