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Title: Structural Evolution of a Cyclooctatetraene Adlayer on Cu(111) during Isothermal Desorption

Here, the use of helium diffraction patterns to study desorption processes is explored as a novel extension to traditional methods based on helium specular reflection. The sample, cyclooctatetraene, adsorbed on Cu(111) provides a rich but complex structure. The modulation of cyclooctatetraene by Cu(111) is manifested as a convolution in the diffraction pattern, displaying an averaged super cell symmetry of (7$$\sqrt{3}$$ x 7$$\sqrt{3}$$)R30°. The adlayer expands during isothermal desorption, and the change in lattice constant provides a direct measure of the coverage as a function of time. We find a desorption energy of 0.96 +/- 0.01 at saturation of the first layer and an upper limit of 1.62 +/- 0.07 for isolated molecules. These values and details of the assigned structure indicate chemisorbed molecules with a planar conformation.
Authors:
 [1] ; ORCiD logo [2] ;  [3] ;  [3] ;  [3] ;  [3] ;  [3] ;  [4] ; ORCiD logo [3]
  1. Univ. of Cambridge (United Kingdom). Cavendish Lab.; Univ. of Goettingen (Germany). Inst. of Physical Chemistry
  2. Univ. of Cambridge (United Kingdom). Cavendish Lab.; Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  3. Univ. of Cambridge (United Kingdom). Cavendish Lab.
  4. Rutgers Univ., New Brunswick, NJ (United States). Dept. of Chemistry and Chemical Biology
Publication Date:
Grant/Contract Number:
AC02-06CH11357; CHE-1565673
Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 122; Journal Issue: 16; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
Blavatnik Family Foundation; International Center for Advanced Studies of Energy Conversion (ICASEC), Gottingen (Germany); Engineering and Physical Sciences Research Council (EPSRC); National Science Foundation (NSF); Ramón Areces Foundation
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE
OSTI Identifier:
1462744