Relative electron affinity of C{sub 60} and C{sub 70} and the Stokes` law radius of the C{sub 70} radical anion in n-hexane by time-of-flight mobility measurements
- Cornell Univ., Ithaca, NY (United States)
The mobility of the C{sub 70} radical anion in n-hexane at room temperature has been measured by the condensed-phase thin-sheet time-of-flight (TOF) technique. The observed value of 5.2 x 10{sup -4} cm{sup 2}/(V s) corresponds to a Stokes radius of 5.4 A, consistent with the molecular geometry of the C{sub 70} molecule as determined by electron diffraction. TOF measurements of anionic mobility in n-hexane, where both C{sub 70} and C{sub 60} are present and compete for photoelectrons, show that the predominant anion changes from C{sub 70}{sup -} to C{sub 60}{sup -} as the C{sub 60} to C{sub 70} concentration ratio is increased from 2 to 20. Quantitative analysis of these `competition experiments` shows that the electron affinity of C{sub 70} exceeds that of C{sub 60} by 0.025 {+-} 0.007 eV in n-hexane and (through a thermodynamic cycle) by 0.073 {+-} 0.019 eV in the gas phase. 18 refs., 4 figs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 90944
- Journal Information:
- Journal of Physical Chemistry, Vol. 99, Issue 31; Other Information: PBD: 3 Aug 1995
- Country of Publication:
- United States
- Language:
- English
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