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Molecules 2014, 19(8), 10845-10862; doi:10.3390/molecules190810845

Desorption of Water from Distinct Step Types on a Curved Silver Crystal

1
Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand
2
Leiden Institute of Chemistry, Leiden University, PO BOX 9502, 2300 RA Leiden, The Netherlands
*
Author to whom correspondence should be addressed.
Received: 24 March 2014 / Revised: 28 May 2014 / Accepted: 30 June 2014 / Published: 25 July 2014
(This article belongs to the Special Issue Surface Chemistry)
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Abstract

We have investigated the adsorption of H2O onto the A and B type steps on an Ag single crystal by temperature programmed desorption. For this study, we have used a curved crystal exposing a continuous range of surface structures ranging from [5(111) × (100)] via (111) to [5(111) × (110)]. LEED and STM studies verify that the curvature of our sample results predominantly from monoatomic steps. The sample thus provides a continuous array of step densities for both step types. Desorption probed by spatially-resolved TPD of multilayers of H2O shows no dependence on the exact substrate structure and thus confirms the absence of thermal gradients during temperature ramps. In the submonolayer regime, we observe a small and linear dependence of the desorption temperature on the A and B step density. We argue that such small differences are only observable by means of a single curved crystal, which thus establishes new experimental benchmarks for theoretical calculation of chemically accurate binding energies. We propose an origin of the observed behavior based on a “two state” desorption model. View Full-Text
Keywords: silver; water; adsorption; single crystal; steps; surface science silver; water; adsorption; single crystal; steps; surface science
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MDPI and ACS Style

Janlamool, J.; Bashlakov, D.; Berg, O.; Praserthdam, P.; Jongsomjit, B.; Juurlink, L.B.F. Desorption of Water from Distinct Step Types on a Curved Silver Crystal. Molecules 2014, 19, 10845-10862.

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