Dynamical steering in an electron transfer surface reaction: Oriented NO(v = 3, 0.08 < E_i < 0.89 eV) relaxation in collisions with a Au(111) surface

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作   者：

Nils Bartels;  Kai Golibrzuch;  Christof Bartels;  Li Chen;  Daniel J. Auerbach;  Alec M. Wodtke;  Tim Sch?fer; 

作者机构：

37077 G?ttingen;  Institute of Physical Chemistry;  Georg-August University of G?ttingen;  Germany;  Tammannstra?e 6;  Max Planck Institute for Biophysical Chemistry;  Am Fa?berg 11;  Department of Dynamics at Surfaces; 

关键词：

Dynamical steering;  electron transfer;  collisions; 

期刊名称：

The Journal of Chemical Physics

i s s n：

0021-9606

年卷期：

2014 年 140 卷 5 期

页   码：

054710-1-054710-9

页   码：

摘   要：

We report measurements of the incidence translational energy dependence of steric effects in collisions of NO(v = 3) molecules with a Au(111) surface using a recently developed technique to orient beams of vibrationally excited NO molecules at incidence energies of translation between 0.08 and 0.89 eV. Incidence orientation dependent vibrational state distributions of scattered molecules are detected by means of resonance enhanced multiphoton ionization spectroscopy. Molecules oriented with the N-end towards the surface exhibit a higher vibrational relaxation probability than those oriented with the O-end towards the surface. This strong orientation dependence arises from the orientation dependence of the underlying electron transfer reaction responsible for the vibrational relaxation. At reduced incidence translational energy, we observe a reduced steric effect. This reflects dynamical steering and re-orientation of the NO molecule upon its approach to the surface.