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

Lau, J. A.; Calvo-Almazan, I.; Townsend, P. S.  M.; Ward, D. J.; Jardine, A. P.; Allison, W.; Ellis, J.; Hinch, B. J.; Avidor, N.

doi:10.1021/acs.jpcc.8b00482

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

Journal Article · Tue Apr 03 00:00:00 EDT 2018 · Journal of Physical Chemistry. C

DOI:https://doi.org/10.1021/acs.jpcc.8b00482· OSTI ID:1462744

Lau, J. A. ^[1]; ^[2]; Townsend, P. S. M. ^[3]; Ward, D. J. ^[3]; Jardine, A. P. ^[3]; Allison, W. ^[3]; Ellis, J. ^[3]; Hinch, B. J. ^[4]; ^[3]

Univ. of Cambridge (United Kingdom). Cavendish Lab.; Univ. of Goettingen (Germany). Inst. of Physical Chemistry
Univ. of Cambridge (United Kingdom). Cavendish Lab.; Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Univ. of Cambridge (United Kingdom). Cavendish Lab.
Rutgers Univ., New Brunswick, NJ (United States). Dept. of Chemistry and Chemical Biology

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.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: Blavatnik Family Foundation; Engineering and Physical Sciences Research Council (EPSRC); International Center for Advanced Studies of Energy Conversion (ICASEC), Gottingen (Germany); National Science Foundation (NSF); Ramón Areces Foundation

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1462744

Journal Information:: Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 16 Vol. 122; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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