Low-energy electron interactions with organic molecules: Negative ion states of fluorobenzenes
- 15 October 1978
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 69 (8), 3807-3818
- https://doi.org/10.1063/1.437045
Abstract
An electron transmission technique has been employed to determine the positions of the three π‐negative ion states (configurations π12π22π23π41, π21π22π23π15, and π21π22π23π16) of benzene and fluorobenzenes in the vapor phase. These are 1.13 (1.35), 1.13 (1.35), (4.80) eV for benzene; 0.82 (0.91), (1.40), (4.66) eV for fluorobenzene; 0.53 (0.62), (1.41), (4.51) eV for p‐difluorobenzene; (0.77), (0.77), (4.48) eV for 1,3,5‐trifluorobenzene; 0.34, (0.50), (1.29), (4.51) eV for 2,3,5,6‐tetrafluorobenzene; isolated molecules of these compounds are equal to −1.13, −0.82, −0.53, ≳−0.77, −0.34, ?−0.15, ≳−0.42 eV for benzene, fluorobenzene, difluorobenzene, 1,3,5‐trifluorobenzene, 2,3,5,6‐tetrafluorobenzene, pentafluorobenzene, and hexafluorobenzene, respectively. The present results, therefore, suggest that the π‐electron affinity of C6F6 is 6F6 is known to have a positive (+1.8 eV) E.A. and although the parent ion, C6F6−*, is known to form with a very large electron attachment cross section at ∼0.0 eV and to be long lived (∼12 μsec). These findings are reconciled, discussed in connection with previously published data, and are theoretically treated. They extend our understanding of the negative ion states of substituted benzenes.Keywords
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