Abstract
This paper demonstrates that electronically resonant inelastic electron scattering can be used to probe the vibrational dynamics of chemisorbed species, and that the formation of a transient negative ion during scattering can lead to significant enhancement in the probability for vibrationally inelastic scattering. We specifically examine CO/Ni(111) chemisorbed in a c(4×2) structure. Our measurements consist of the incident energy dependencies for vibrationally inelastic scattering from different adsorbate modes, as well as the final angular distributions for electrons emerging from the transiently formed resonance. We also observe the presence of weak first overtone scattering for the CO intramolecular stretch under resonant scattering conditions. All of the observations are consistent with the formation of a Σ shape resonance in the vicinity of 18 eV which is slightly lower in energy, and has a shortened lifetime, than in the gas phase. Discussions are presented which emphasize that the presence (or absence) of vibrational excitation in a given vibrational coordinate following negative ion formation can be used to infer important details about femtosecond nuclear coordinate evolution for the system in the excited state.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |
| Editors | Hai-Lung Dai, Steven J. Sibener |
| Place of Publication | Bellingham, WA, United States |
| Publisher | Society of Photo-Optical Instrumentation Engineers |
| Pages | 296-302 |
| Number of pages | 7 |
| Volume | 2125 |
| ISBN (Print) | 0819414182 |
| Publication status | Published - 1994 Dec 1 |
| Externally published | Yes |
| Event | Laser Techniques for Surface Science - Los Angeles, CA, USA Duration: 1994 Jan 27 → 1994 Jan 29 |
Other
| Other | Laser Techniques for Surface Science |
|---|---|
| City | Los Angeles, CA, USA |
| Period | 94/1/27 → 94/1/29 |
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ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Condensed Matter Physics
Cite this
Shape resonance scattering as a probe of excited-state adsorbate dynamics for CO chemisorbed on Ni(111). / Ha, Jeong Sook; Sibener, Steven J.
Proceedings of SPIE - The International Society for Optical Engineering. ed. / Hai-Lung Dai; Steven J. Sibener. Vol. 2125 Bellingham, WA, United States : Society of Photo-Optical Instrumentation Engineers, 1994. p. 296-302.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Shape resonance scattering as a probe of excited-state adsorbate dynamics for CO chemisorbed on Ni(111)
AU - Ha, Jeong Sook
AU - Sibener, Steven J.
PY - 1994/12/1
Y1 - 1994/12/1
N2 - This paper demonstrates that electronically resonant inelastic electron scattering can be used to probe the vibrational dynamics of chemisorbed species, and that the formation of a transient negative ion during scattering can lead to significant enhancement in the probability for vibrationally inelastic scattering. We specifically examine CO/Ni(111) chemisorbed in a c(4×2) structure. Our measurements consist of the incident energy dependencies for vibrationally inelastic scattering from different adsorbate modes, as well as the final angular distributions for electrons emerging from the transiently formed resonance. We also observe the presence of weak first overtone scattering for the CO intramolecular stretch under resonant scattering conditions. All of the observations are consistent with the formation of a Σ shape resonance in the vicinity of 18 eV which is slightly lower in energy, and has a shortened lifetime, than in the gas phase. Discussions are presented which emphasize that the presence (or absence) of vibrational excitation in a given vibrational coordinate following negative ion formation can be used to infer important details about femtosecond nuclear coordinate evolution for the system in the excited state.
AB - This paper demonstrates that electronically resonant inelastic electron scattering can be used to probe the vibrational dynamics of chemisorbed species, and that the formation of a transient negative ion during scattering can lead to significant enhancement in the probability for vibrationally inelastic scattering. We specifically examine CO/Ni(111) chemisorbed in a c(4×2) structure. Our measurements consist of the incident energy dependencies for vibrationally inelastic scattering from different adsorbate modes, as well as the final angular distributions for electrons emerging from the transiently formed resonance. We also observe the presence of weak first overtone scattering for the CO intramolecular stretch under resonant scattering conditions. All of the observations are consistent with the formation of a Σ shape resonance in the vicinity of 18 eV which is slightly lower in energy, and has a shortened lifetime, than in the gas phase. Discussions are presented which emphasize that the presence (or absence) of vibrational excitation in a given vibrational coordinate following negative ion formation can be used to infer important details about femtosecond nuclear coordinate evolution for the system in the excited state.
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UR - http://www.scopus.com/inward/citedby.url?scp=0028732633&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:0028732633
SN - 0819414182
VL - 2125
SP - 296
EP - 302
BT - Proceedings of SPIE - The International Society for Optical Engineering
A2 - Dai, Hai-Lung
A2 - Sibener, Steven J.
PB - Society of Photo-Optical Instrumentation Engineers
CY - Bellingham, WA, United States
ER -