Vibrationally resolved inelastic scattering and charge transfer in H[sup +]--C[sub 2]H[sub 4] collisions

Journal Article · Sun Aug 15 00:00:00 EDT 1993 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.465230· OSTI ID:5517935

Aristov, N; Maring, W; Niedner-Schatteburg, G; Toennies, J P ^[1]; Chiu, Y ^[2]; Koeppel, H ^[3]

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1. Max-Planck-Institut fuer Stroemungsforschung, Bunsenstr. 10, 3400 Goettingen (Germany)
2. Center for Molecular Dynamics and Energy Transfer, Department of Chemistry, The Catholic University of America, Washington DC 20064 (United States)
3. Institut fuer Physikalische Chemie, Universitaet Heidelberg, 6900 Heidelberg (Germany)

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 C[sub 2]H[sub 5][sup +] complexes.

• OSTI ID: 5517935
• Journal Information: Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 99:4; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ALKENES
BEAMS
CATIONS
CHARGE EXCHANGE
CHARGED PARTICLES
COLLIDING BEAMS
COLLISIONS
COMPLEXES
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ENERGY LEVELS
ETHYLENE
EXCITED STATES
HYDROCARBONS
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
INELASTIC SCATTERING
INFRARED SPECTRA
ION COLLISIONS
ION-MOLECULE COLLISIONS
IONS
MASS SPECTRA
MOLECULAR BEAMS
MOLECULE COLLISIONS
ORGANIC COMPOUNDS
RESOLUTION
SCATTERING
SPECTRA
TIME-OF-FLIGHT METHOD
VIBRATIONAL STATES