Abstract
The formation of negative ions by perfluoro-n-butane as a result of electron bombardment at low electron energies has been studied and various processes suggested to explain ion formation. At 0 eV a metastable molecular negative ion is formed, the autodetachment lifetime of which has been measured as 12.7 ± 0.3 μsec. The electron attachment cross-section of perfluoro-n-butane has been estimated to be ∼ 10 −18 cm 2. Values of 2.2 ± 0.3, 2.2 ± 0.2 and 3.2 ± 0.3 eV have been estimated for the electron affinities of C 2F 5, C 3F 7 and C 4F 9 respectively.
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