The Library
X-ray standing wave studies of molecular adsorption : why coherent fractions matter
Tools
Woodruff, D. P. and Duncan, D. A. (2020) X-ray standing wave studies of molecular adsorption : why coherent fractions matter. New Journal of Physics, 22 (11). 113012. doi:10.1088/1367-2630/abc63a ISSN 1367-2630.
|
PDF
WRAP-X-ray-standing-wave-studies-molecular-adsorption-2020.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (2187Kb) | Preview |
Official URL: https://doi.org/10.1088/1367-2630/abc63a
Abstract
The normal incidence x-ray standing wave (NIXSW) technique is the primary source of quantitative experimental information on the adsorption height of many near-planar molecules on metal surfaces, of relevance to organic electronics. The technique yields two structural parameters, the coherent position and the coherent fraction. For high values of the coherent fraction the coherent position can be related directly to the adsorption height, but because the coherent fraction is effectively an order parameter, low values of this parameter are often attributed to partial disorder. It is certainly true that in depositing these large molecules on a surface it is very challenging to produce a perfectly ordered surface. However, is the type of disorder that is likely to occur able to account for no other effect on measured NIXSW data than a lowering of the coherent fraction? Here we show, by considering a wide range of possible types of ‘disorder’, that in almost all such situations it is improbable that the coherent positions associated with very low coherent fractions actually provide a reliable measure of the adsorption height of the ordered component, as is often assumed to be the case. As such, presentations of NIXSW data that only consider coherent position values are likely to be extremely misleading, and provide an unreliable benchmark for detailed understanding of these interfaces.
Item Type: | Journal Article | ||||||
---|---|---|---|---|---|---|---|
Subjects: | Q Science > QA Mathematics Q Science > QC Physics Q Science > QD Chemistry |
||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
SWORD Depositor: | Library Publications Router | ||||||
Library of Congress Subject Headings (LCSH): | Standing waves -- Research, Electromagnetic waves, Adsorption, Surfaces, Interfaces (Physical sciences) | ||||||
Journal or Publication Title: | New Journal of Physics | ||||||
Publisher: | IOP Publishing | ||||||
ISSN: | 1367-2630 | ||||||
Official Date: | 12 November 2020 | ||||||
Dates: |
|
||||||
Volume: | 22 | ||||||
Number: | 11 | ||||||
Article Number: | 113012 | ||||||
DOI: | 10.1088/1367-2630/abc63a | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Copyright Holders: | © 2020 The Author(s) | ||||||
Date of first compliant deposit: | 15 January 2021 | ||||||
Date of first compliant Open Access: | 22 January 2021 | ||||||
Related URLs: |
Request changes or add full text files to a record
Repository staff actions (login required)
View Item |
Downloads
Downloads per month over past year