Vibrationally resolved inelastic scattering and charge transfer in H+–C2H4 collisions

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 o...

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Veröffentlicht in:The Journal of chemical physics 1993-08, Vol.99 (4), p.2682-2694
Hauptverfasser: Aristov, N., Maring, W., Niedner-Schatteburg, G., Toennies, J. P., Chiu, Y.-N., Köppel, H.
Format: Artikel
Sprache:eng
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Zusammenfassung: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.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.465230