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  Electronically nonadiabatic vibrational excitation of N-2 scattered from Pt(111).

Werdecker, J., Shirhatti, P. R., Golibrzuch, K., Bartels, C., Wodtke, A. M., & Harding, D. J. (2015). Electronically nonadiabatic vibrational excitation of N-2 scattered from Pt(111). Journal of Physical Chemistry C, 119(26), 14722-14727. doi:10.1021/acs.jpcc.5b00202.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-137E-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-3101-1
Genre: Journal Article

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Werdecker, J.1, Author              
Shirhatti, P. R.1, Author              
Golibrzuch, K.1, Author              
Bartels, C.1, Author              
Wodtke, A. M.1, Author              
Harding, D. J.1, Author              
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1Department of Dynamics at Surfaces, MPI for biophysical chemistry, Max Planck Society, ou_578600              

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 Abstract: Molecular beam surface scattering is used to compare vibrational excitation of N-2 molecules in collisions with clean Pt(111) and Au(111) surfaces under UHV conditions. Direct single-bounce collisions are dominant under all conditions of this work, as evidenced by narrow specular angular scattering distributions and translational incidence energy dependent rotational temperatures. N-2(v = 0 -> 1) vibrational excitation is observed for Pt(111), but not Au(111). The excitation probabilities, ranging from to similar to 10(-3), follow an Arrhenius surface temperature dependence and increase with translational incidence energy with zero threshold. The observations are the typical fingerprint of nonadiabatic vibrational excitation due to an electron mediated excitation mechanism, identified in previous work on NO and CO scattering from electron affinity of the N-2 molecule (EA = -2.3 eV) makes this observation surprising and we discuss possible mechanisms.

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Language(s): eng - English
 Dates: 2015-03-232015-07-02
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1021/acs.jpcc.5b00202
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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: 14722 - 14727 Identifier: -