The Open UniversitySkip to content
 

Mass Transport in Surface Diffusion of van der Waals Bonded Systems: Boosted by Rotations?

Hedgeland, Holly; Sacchi, Marco; Singh, Pratap; McIntosh, Andrew J.; Jardine, Andrew P.; Alexandrowicz, Gil; Ward, David J.; Jenkins, Stephen J.; Allison, William and Ellis, John (2016). Mass Transport in Surface Diffusion of van der Waals Bonded Systems: Boosted by Rotations? The Journal of Physical Chemistry Letters, 7(23) pp. 4819–4824.

Full text available as:
[img]
Preview
PDF (Accepted Manuscript) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (1MB) | Preview
DOI (Digital Object Identifier) Link: https://doi.org/10.1021/acs.jpclett.6b02024
Google Scholar: Look up in Google Scholar

Abstract

Mass transport at a surface is a key factor in heterogeneous catalysis. The rate is determined by excitation across a translational barrier and depends on the energy landscape and the coupling to the thermal bath of the surface. Here we use helium spin−echo spectroscopy to track the microscopic motion of benzene adsorbed on Cu(001) at low coverage (θ ∼ 0.07 ML). Specifically, our combined experimental and computational data determine both the absolute rate and mechanism of the molecular motion. The observed rate is significantly higher by a factor of 3.0 ± 0.1 than is possible in a conventional, point-particle model and can be understood only by including additional molecular (rotational) coordinates. We argue that the effect can be described as an entropic contribution that enhances the population of molecules in the transition state. The process is generally relevant to molecular systems and illustrates the importance of the pre-exponential factor alongside the activation barrier in studies of surface kinetics.

Item Type: Journal Item
Copyright Holders: 2016 American Chemical Society
ISSN: 1948-7185
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Physics
Item ID: 47808
Depositing User: Holly Hedgeland
Date Deposited: 15 Nov 2016 09:21
Last Modified: 02 Jun 2019 12:26
URI: http://oro.open.ac.uk/id/eprint/47808
Share this page:

Metrics

Altmetrics from Altmetric

Citations from Dimensions

Download history for this item

These details should be considered as only a guide to the number of downloads performed manually. Algorithmic methods have been applied in an attempt to remove automated downloads from the displayed statistics but no guarantee can be made as to the accuracy of the figures.

Actions (login may be required)

Policies | Disclaimer

© The Open University   contact the OU