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Rotationally-resolved scattering of formaldehyde from the Au(111) surface: An axis specific rotational rainbow and its role in trapping probability
Park, Barratt
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https://hdl.handle.net/2142/96889
Description
- Title
- Rotationally-resolved scattering of formaldehyde from the Au(111) surface: An axis specific rotational rainbow and its role in trapping probability
- Author(s)
- Park, Barratt
- Contributor(s)
- Schaefer, Tim
- Wodtke, Alec
- Kandratsenka, Alexander
- Meyer, Sven
- Krueger, Bastian C.
- Issue Date
- 2017-06-21
- Keyword(s)
- Dynamics and kinetics
- Date of Ingest
- 2017-07-27T20:15:10Z
- 2018-01-29T23:05:29Z
- Abstract
- The conversion of translational to rotational motion often plays a major role in the trapping of small molecules at surfaces, a crucial first step for a wide variety of chemical processes that occur at gas-surface interfaces. However, to date most quantum-state resolved surface scattering experiments have been performed on diatomic molecules, and very little detailed information is available about how the structure of non-linear polyatomic molecules influences the mechanisms for energy exchange with surfaces. In the current work, we employ a new rotationally-resolved $1+1'$ resonance-enhanced multiphoton ionization (REMPI) scheme to measure rotational distribution in formaldehyde molecules directly scattered from the Au(111) surface at incident kinetic energies in the range 0.3--1.2 eV. The results indicate a pronounced propensity to excite $a$-axis rotation (twirling) rather than $b$- or $c$-axis rotation (tumbling or cartwheeling), and are consistent with a rotational rainbow scattering model. Classical trajectory calculations suggest that the effect arises---to zeroth order---from the three-dimensional shape of the molecule (steric effects). The results have broad implications for the enhanced trapping probability of prolate and near-prolate molecules at surfaces.
- Publisher
- International Symposium on Molecular Spectroscopy
- Type of Resource
- text
- Genre of Resource
- Conference Paper / Presentation
- Language
- eng
- Permalink
- http://hdl.handle.net/2142/96889
- DOI
- https://doi.org/10.15278/isms.2017.WH07
- Copyright and License Information
- Copyright 2017 Barratt Park
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