| Autor: |
Neumaier, Marco, Hampe, Oliver, Kappes, Manfred M. |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 8/15/2005, Vol. 123 Issue 7, p074313, 8p, 2 Charts, 8 Graphs |
| Abstrakt: |
Electron transfer collisions of trapped doubly charged fullerene anions C762-, C782-, and C842- with SF6 are studied in a Fourier transform ion cyclotron resonance mass spectrometer at center-of-mass collisional energies ranging from thermal energy to 77 eV. Collision energy dependencies manifest threshold energies for (nominally exoergic) single electron transfer onto SF6 of 1.46±0.3 eV, 1.56±0.3 eV, and 1.63±0.3 eV for C762-, C782-, and C842-, respectively. Kinetics studies reveal charge-transfer cross sections of up to 430±200 Å2 for C842- at a collision energy of 77 eV. The mechanism and the energetics are discussed in terms of classical electrostatic model calculations. Additionally, we rationalize the collision energy dependencies of the charge-transfer cross sections using the two-state Landau-Zener formalism to describe the associated resonant electron tunneling probability. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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