Abstracts of Bell System Technical Papers Not Published in this Journal (01 July 1953)

Formative of Negative Ions of Sulfur Hexafluoride, J. Chem. Phys., 21, p p . 119-124, Jan . , 1953. Negative ion production in SF 6 has been studied in a mass spectrometer; SFo-, SF 6 -, SF2-, F- were identified. The SF 6 - and SF s - are produced in verylarge quantities by a resonance capture process at an electron energy of about 2 ev, and are formed in approximately equal amounts. 

At higher electron energies, the same capture occurs by a secondary process, in which low energy electrons released by other excitation and ionization processes suffer the resonance capture. Partial dissociation after electron capture accounts for the appearance of F- and F