| Autor: |
Aristov, N., Maring, W., Niedner-Schatteburg, G., Toennies, J. P., Chiu, Y.-N., Köppel, H. |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 8/15/1993, Vol. 99 Issue 4, p2682, 13p |
| Abstrakt: |
Differential cross sections and time-of-flight spectra have been measured in a crossed molecular beam apparatus for inelastic scattering and charge transfer in collisions of 30 eV protons with ethylene. High resolution inelastic time-of-flight spectra reveal peaks corresponding to the fundamentals of at least two of the infrared active antisymmetric vibrational modes of ethylene. In the time-of-flight spectra of H atoms resulting from charge transfer energy loss, peaks corresponding to excitation of two electronic states of the ethylene molecular ion are resolved. The H-atom product angular distributions are consistent with a 2.0 eV potential well in the ground state potential energy surface of the charge transfer reaction. The observations for the antisymmetric vibrational modes are explained in terms of an ion-induced dipole mechanism. Excitation of the symmetric modes is attributed to a vibronic coupling mechanism. An appendix provides a detailed account of the vibronic distributions in idealized low energy, high symmetry collisions leading to stable C2H5+ complexes. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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