Author:
Golibrzuch Kai,Baraban Joshua H.,Shirhatti Pranav R.,Werdecker Jörn,Bartels Christof,Wodtke Alec M.
Abstract
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, E
I, providing
unambiguous evidence that the scattered molecules were not trapped and
equilibrated on the surface. We report the E
I-dependence
of the collisional excitation of one and two quanta of the
trans-bending vibrational mode, ν
4 = 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.
Subject
Physical and Theoretical Chemistry
Cited by
10 articles.
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