Electron Affinity of trans-2-C4F8 from Electron Attachment-Detachment Kinetics
COLLEGE OF THE HOLY CROSS WORCESTER MA DEPT OF CHEMISTRY
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Electron attachment and detachment kinetics of 2-C4F8 were studied over the temperature range 298-487 K with a flowing-afterglow Langmuir-probe apparatus. Only parent anions were formed in the attachment process throughout this temperature range. At the highest temperatures, thermal electron detachment of the parent anions is important. Analysis of the 2-C4F8 gas showed an 8218 mixture of transcis isomers. The kinetic data at the higher temperatures were used to determine the electron affinity EAtrans-2-C4F8 0.79 - 0.06 eV after making some reasonable assumptions. The same quantity was calculated using the G3MP2 compound method, yielding 0.74 eV. The kinetic data were not sufficient to establish a reliable value for EAcis-2-C4F8, but G3MP2 calculations give a value 0.017 eV greater than that for trans-2-C4F8. MP2 and density functional theory were used to study the structural properties of the neutral and anion isomers.
- Physical Chemistry
- Nuclear Physics and Elementary Particle Physics