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Observation of translation-to-vibration excitation in acetylene scattering from Au(111): A REMPI based approach.

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Golibrzuch,  K.
Department of Dynamics at Surfaces, MPI for biophysical chemistry, Max Planck Society;

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Shirhatti,  P. R.
Department of Dynamics at Surfaces, MPI for biophysical chemistry, Max Planck Society;

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Werdecker,  J.
Department of Dynamics at Surfaces, MPI for biophysical chemistry, Max Planck Society;

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Bartels,  C.
Department of Dynamics at Surfaces, MPI for biophysical chemistry, Max Planck Society;

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Wodtke,  A. M.
Department of Dynamics at Surfaces, MPI for biophysical chemistry, Max Planck Society;

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Citation

Golibrzuch, K., Baraban, J. H., Shirhatti, P. R., Werdecker, J., Bartels, C., & Wodtke, A. M. (2015). Observation of translation-to-vibration excitation in acetylene scattering from Au(111): A REMPI based approach. Zeitschrift für Pysikalische Chemie, 229(10-12), 1929-1949. doi:10.1515/zpch-2015-0606.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0029-1CCA-7
Abstract
We present quantum-state and velocity resolved experiments for molecular beam scattering of acetylene (C2H2) from a single-crystal Au(111) surface, observations that reveal translational, rotational and vibrational inelasticity. The experiments are made possible by a novel (1 + 2) REMPI scheme for acetylene. The scattered molecules' velocity distributions as well as their ro-vibrational quantum-state distributions depend on the translational energy of incidence, EI, providing unambiguous evidence that the scattered molecules were not trapped and equilibrated on the surface. We report the EI-dependence of the collisional excitation of one and two quanta of the trans-bending vibrational mode, ν4 = 0 → 1, 2, which is consistent with a mechanism involving conversion of incidence translational energy to acetylene vibration. Rotationally resolved velocity measurements on scattered acetylene in its ground vibrational state are interpreted in terms of orientation-dependent rotational and vibrational excitation probabilities.