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Probing adsorbate state lifetime with low energy ions
J Sjakste1, A G Borisov, J P Gauyacq
1Laboratoire des Collisions Atomiques et Moléculaires, UMR CNRS-Université Paris-Sud 8625, Bâtiment 351, Université Paris-Sud, 91405 Orsay Cedex, France.
Physical Review Letters
|June 1, 2004
Summary
Charge transfer between a hydrogen ion (H-) and a cesium-coated copper surface (Cs/Cu(111)) was studied. The cesium adsorbate
Area of Science:
- Surface Science
- Atomic and Molecular Physics
- Quantum Chemistry
Background:
- Understanding charge transfer dynamics at metal surfaces is crucial for catalysis and materials science.
- The influence of adsorbates on projectile-surface interactions is a key area of research.
Purpose of the Study:
- To theoretically investigate charge transfer during the backscattering of H- ions from a Cs/Cu(111) surface.
- To analyze the role of Cs adsorbates in modifying projectile-surface charge transfer mechanisms.
Main Methods:
- Wave packet propagation approach was employed for theoretical calculations.
- Simulations focused on the interaction of H- ions with the Cs/Cu(111) system.
Main Results:
- The long lifetime of the Cs-localized state significantly alters charge transfer, reducing its irreversibility.
- Observed oscillations in H- yield as a function of projectile energy due to back-and-forth electron transfer.
- Evidence of resonant electron transfer between the projectile and the Cs adsorbate.
Conclusions:
- Cesium adsorbates play a critical role in mediating charge transfer dynamics at metal surfaces.
- The findings highlight the importance of adsorbate properties in controlling ion-surface interactions.
- Oscillatory H- yield provides a signature of the dynamic electron exchange process.