Adlayer structure dependent ultrafast desorption dynamics in carbon monoxide adsorbed on Pd (111)
Abstract
Here, we report our ultrafast photoinduced desorption investigation of the coverage dependence of substrate–adsorbate energy transfer in carbon monoxide adlayers on the (111) surface of palladium. As the CO coverage is increased, the adsorption site population shifts from all threefold hollows (up to 0.33 ML), to bridge and near bridge (>0.5 to 0.6 ML) and finally to mixed threefold hollow plus top site (at saturation at 0.75 ML). We show that between 0.24 and 0.75 ML this progression of binding site motifs is accompanied by two remarkable features in the ultrafast photoinduced desorption of the adsorbates: (i) the desorption probability increases roughly two orders magnitude, and (ii) the adsorbate–substrate energy transfer rate observed in two-pulse correlation experiments varies nonmonotonically, having a minimum at intermediate coverages. Simulations using a phenomenological model to describe the adsorbate–substrate energy transfer in terms of frictional coupling indicate that these features are consistent with an adsorption-site dependent electron-mediated energy coupling strength, ηel, that decreases with binding site in the order: three-fold hollow > bridge and near bridge > top site. This weakening of ηel largely counterbalances the decrease in the desorption activation energy that accompanies this progression of adsorption site motifs, moderating what would otherwise bemore »
- Authors:
-
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Stony Brook Univ., Stony Brook, NY (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., Stony Brook, NY (United States)
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1329916
- Alternate Identifier(s):
- OSTI ID: 1259999
- Report Number(s):
- BNL-112726-2016-JA
Journal ID: ISSN 0021-9606; JCPSA6; R&D Project: CO007; KC0301050
- Grant/Contract Number:
- SC00112704; SC0012704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Chemical Physics
- Additional Journal Information:
- Journal Volume: 145; Journal Issue: 1; Journal ID: ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; desorption; energy transfer; adsorbates; electroluminescence; friction
Citation Formats
Hong, Sung -Young, Xu, Pan, Camillone, Nina R., White, Michael G., and Camillone, III, Nicholas. Adlayer structure dependent ultrafast desorption dynamics in carbon monoxide adsorbed on Pd (111). United States: N. p., 2016.
Web. doi:10.1063/1.4954408.
Hong, Sung -Young, Xu, Pan, Camillone, Nina R., White, Michael G., & Camillone, III, Nicholas. Adlayer structure dependent ultrafast desorption dynamics in carbon monoxide adsorbed on Pd (111). United States. https://doi.org/10.1063/1.4954408
Hong, Sung -Young, Xu, Pan, Camillone, Nina R., White, Michael G., and Camillone, III, Nicholas. Fri .
"Adlayer structure dependent ultrafast desorption dynamics in carbon monoxide adsorbed on Pd (111)". United States. https://doi.org/10.1063/1.4954408. https://www.osti.gov/servlets/purl/1329916.
@article{osti_1329916,
title = {Adlayer structure dependent ultrafast desorption dynamics in carbon monoxide adsorbed on Pd (111)},
author = {Hong, Sung -Young and Xu, Pan and Camillone, Nina R. and White, Michael G. and Camillone, III, Nicholas},
abstractNote = {Here, we report our ultrafast photoinduced desorption investigation of the coverage dependence of substrate–adsorbate energy transfer in carbon monoxide adlayers on the (111) surface of palladium. As the CO coverage is increased, the adsorption site population shifts from all threefold hollows (up to 0.33 ML), to bridge and near bridge (>0.5 to 0.6 ML) and finally to mixed threefold hollow plus top site (at saturation at 0.75 ML). We show that between 0.24 and 0.75 ML this progression of binding site motifs is accompanied by two remarkable features in the ultrafast photoinduced desorption of the adsorbates: (i) the desorption probability increases roughly two orders magnitude, and (ii) the adsorbate–substrate energy transfer rate observed in two-pulse correlation experiments varies nonmonotonically, having a minimum at intermediate coverages. Simulations using a phenomenological model to describe the adsorbate–substrate energy transfer in terms of frictional coupling indicate that these features are consistent with an adsorption-site dependent electron-mediated energy coupling strength, ηel, that decreases with binding site in the order: three-fold hollow > bridge and near bridge > top site. This weakening of ηel largely counterbalances the decrease in the desorption activation energy that accompanies this progression of adsorption site motifs, moderating what would otherwise be a rise of several orders of magnitude in the desorption probability. Within this framework, the observed energy transfer rate enhancement at saturation coverage is due to interadsorbate energy transfer from the copopulation of molecules bound in three-fold hollows to their top-site neighbors.},
doi = {10.1063/1.4954408},
journal = {Journal of Chemical Physics},
number = 1,
volume = 145,
place = {United States},
year = {Fri Jul 01 00:00:00 EDT 2016},
month = {Fri Jul 01 00:00:00 EDT 2016}
}
Web of Science
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Works referencing / citing this record:
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