Chemically induced electronic excitations at metal surfaces

Gergen, Brian, Nienhaus, Hermann, Weinberg, W. Henry and McFarland, Eric W. (2001) Chemically induced electronic excitations at metal surfaces. Science, 294 5551: 2521-2523. doi:10.1126/science.1066134


Author Gergen, Brian
Nienhaus, Hermann
Weinberg, W. Henry
McFarland, Eric W.
Title Chemically induced electronic excitations at metal surfaces
Journal name Science   Check publisher's open access policy
ISSN 0036-8075
1095-9203
Publication date 2001-12-21
Sub-type Letter to editor, brief commentary or brief communication
DOI 10.1126/science.1066134
Open Access Status Not yet assessed
Volume 294
Issue 5551
Start page 2521
End page 2523
Total pages 3
Place of publication Washington, DC, United States
Publisher American Association for the Advancement of Science
Language eng
Abstract The energy released in low-energy chemisorption or physisorption of molecules on metal surfaces is usually expected to be dissipated by surface vibrations (phonons). Theoretical descriptions of competing electronic excitations are incomplete, and experimental observation of excited charge carriers has been difficult except at energies high enough to eject electrons from the surface. We observed reaction-induced electron excitations during gas interactions with polycrystalline silver for a variety of species with adsorption energies between 0.2 and 3.5 electron volts. The probability of exciting a detectable electron increases with increasing adsorption energy, and the measured time dependence of the electron current can be understood in terms of the strength and mechanism of adsorption.
Q-Index Code CX
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Letter to editor, brief commentary or brief communication
Collection: School of Chemical Engineering Publications
 
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