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  State-to-state time-of-flight measurements of NO scattering from Au(111): Direct observation of translation-to-vibration coupling in electronically nonadiabatic energy transfer.

Golibrzuch, K., Shirhatti, P. R., Altschäffel, J., Rahinov, I., Auerbach, D. J., Wodtke, A. M., et al. (2013). State-to-state time-of-flight measurements of NO scattering from Au(111): Direct observation of translation-to-vibration coupling in electronically nonadiabatic energy transfer. Journal of Physical Chemistry A, 117(36), 8750-8760. doi:10.1021/jp403382b.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-7EBA-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-CBC2-B
Genre: Journal Article

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1936303.pdf (Publisher version), 2MB
 
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http://pubs.acs.org/doi/pdf/10.1021/jp403382b (Publisher version)
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Golibrzuch, K.1, Author              
Shirhatti, P. R.1, Author              
Altschäffel, J., Author
Rahinov, I., Author
Auerbach, D. J.1, Author              
Wodtke, A. M.1, Author              
Bartels, C.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: Translational motion is believed to be a spectator degree of freedom in electronically nonadiabatic vibrational energy transfer between molecules and metal surfaces, but the experimental evidence available to support this view is limited. In this work, we have experimentally determined the translational inelasticity in collisions of NO molecules with a single-crystal Au(111) surface-a system with strong electronic nonadiabaticity. State-to-state molecular beam surface scattering was combined with an IR-UV double resonance scheme to obtain high-resolution time-of-flight data. The measurements include vibrationally elastic collisions (v = 3 -> 3, 2 -> 2) as well as collisions where one or two quanta of molecular vibration are excited (2 -> 3, 2 -> 4) or de-excited (2 -> 1, 3 -> 2, 3 -> 1). In addition, we have carried out comprehensive measurements of the effects of rotational excitation on the translational energy of the scattered molecules. We find that under all conditions of this work, the NO molecules lose a large fraction (similar to 0.45) of their incidence translational energy to the surface. Those molecules that undergo vibrational excitation (relaxation) during the collision recoil slightly slower (faster) than vibrationally elastically scattered molecules. The amount of translational energy change depends on the surface temperature. The translation-to-rotation coupling, which is well-known for v = 0 -> 0 collisions, is found to be significantly weaker for vibrationally inelastic than elastic channels. Our results clearly show that the spectator view of the translational motion in electronically nonadiabatic vibrational energy transfer between NO and Au(111) is only approximately correct.

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Language(s): eng - English
 Dates: 2013-06-282013-09-12
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1021/jp403382b
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Title: Journal of Physical Chemistry A
Source Genre: Journal
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Pages: - Volume / Issue: 117 (36) Sequence Number: - Start / End Page: 8750 - 8760 Identifier: -