Trapping-desorption and direct-scattering of formaldehyde at Au(111).
Trapping-desorption and direct-scattering of formaldehyde at Au(111).
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Au(111) 上甲醛的捕获-解吸和直接散射
DOI:
10.1039/c7cp03907g
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
T. Schäfer
中科院分区:
文献类型:
--
作者:
B. C. Krüger;G. B. Park;S. Meyer;R. J. V. Wagner;A. M. Wodtke;T. Schäfer
Nonreactive surface scattering of atoms, molecules and clusters can be almost universally described by two mechanisms: trapping-desorption and direct-scattering. A hard cube model with an attractive square well provides a zeroth order description of the branching ratio between these two mechanisms as a function of the incidence energy. However, the trapping process is likely to be enhanced by excitation of internal degrees of freedom during the collision. In this molecular beam surface scattering study, we characterize formaldehyde/Au(111) scattering using angle resolved time-of-flight techniques. The two mechanisms are found to compete in the range of the investigated normal incidence energies between 0.1 and 1.3 eV. Whereas at low incidence energies trapping-desorption dominates, direct-scattering becomes more likely at incidence energies above 0.37 eV. This incidence energy is slightly higher than the desorption energy which is found to be 0.32 ± 0.03 eV by temperature programmed desorption techniques. A simple hard cube model underestimates the observed trapping probabilities indicating the importance of trapping induced by excitation of internal molecular degrees of freedom.
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DOI:
10.1063/1.4948635
发表时间:
2016
期刊:
The Journal of chemical physics
影响因子:
--
作者:
G. B. Park;Bastian C. Krüger;S. Meyer;D. Schwarzer;Tim Schäfer
通讯作者:
Tim Schäfer
DOI:
--
发表时间:
2010
期刊:
Physical Chemistry, Chemical Physics - PCCP
影响因子:
--
作者:
M. Meisinger;A. M. Schulenburg;F. Merkt;Peter Radi
通讯作者:
Peter Radi
DOI:
--
发表时间:
1989
期刊:
影响因子:
--
作者:
A. Kleyn;E. W. Kuipers;M. G. Tenner;S. Stolte
通讯作者:
S. Stolte
影响因子:
8.6
作者:
HURST, JE;BECKER, CA;AUERBACH, DJ
通讯作者:
AUERBACH, DJ
DOI:
--
发表时间:
1993
期刊:
影响因子:
--
作者:
C. Rettner
通讯作者:
C. Rettner