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  The negligible role of C-H stretch excitation in the physisorption of CH4 on Pt(111).

Chen, L., Ueta, H., Chadwick, H., & Beck, R. D. (2015). The negligible role of C-H stretch excitation in the physisorption of CH4 on Pt(111). Journal of Physical Chemistry C, 119(26), 14499-14505. doi:10.1021/jp5064897.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-138A-0 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-3107-6
Genre: Journal Article

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2175640.pdf (Publisher version), 793KB
 
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http://pubs.acs.org/doi/pdf/10.1021/jp5064897 (Publisher version)
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 Creators:
Chen, L.1, Author              
Ueta , H., Author
Chadwick , H., Author
Beck , R. D., Author
Affiliations:
1Department of Dynamics at Surfaces, MPI for Biophysical Chemistry, Max Planck Society, ou_578600              

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 Abstract: We report a molecular beam study of the effect of vibrational excitation on the physisorption of methane on a Pt(111) surface. Our experiments use a continuous molecular beam of CH4, prepared in its antisymmetic C-H stretch mode nu(3) by infrared laser pumping via rapid adiabatic passage. Physisorbed CH4(ads) is detected on a Pt(111) surface by reflection absorption infrared spectroscopy. At a surface temperature of 77 K, the desorption lifetime of CH4(ads) is observed to be 0.4 +/- 0.2 s. Trapping probabilities for the incident CH4 are measured by the King and Wells beam reflectivity method with and without vibrational excitation. Vibrational excitation of the incident CH4 with one quantum of nu(3) vibration does not produce a measurable effect (less than 0.2% change) on the trapping probability, in sharp contrast to the dissociative chemisorption process. The effect of resonant vibrational excitation of physisorbed CH4(ads) on its dissociation rate was also investigated.

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Language(s): eng - English
 Dates: 2014-09-082015-07-02
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1021/jp5064897
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Title: Journal of Physical Chemistry C
Source Genre: Journal
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Pages: - Volume / Issue: 119 (26) Sequence Number: - Start / End Page: 14499 - 14505 Identifier: -