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Tuning Charge Transfer in Ion-Surface Collisions at Hyperthermal Energies

Yao, Yunxi and Giapis, Konstantinos P. (2016) Tuning Charge Transfer in Ion-Surface Collisions at Hyperthermal Energies. ChemPhysChem, 17 (10). pp. 1430-1434. ISSN 1439-4235.

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Charge exchange in ion-surface collisions may be influenced by surface adsorbates to alter the charge state of the scattered projectiles. We show here that the positive ion yield, observed during ion scattering on metal surfaces at low incident energies, is greatly enhanced by adsorbing electronegative species onto the surface. Specifically, when beams of N^+ and O^+ ions are scattered off on clean Au surfaces at hyperthermal energies, no positive ions are observed exiting. Partial adsorption of F atoms on the Au surface, however, leads to the appearance of positively charged primary ions scattering off Au, a direct result of the increase in the Au work function. The inelastic energy losses for positive ion exits are slightly larger than the corresponding ionization energies of the respective N and O atoms, which suggests that the detected positive ions are formed from surface re-ionization during the hard collision event.

Item Type:Article
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URLURL TypeDescription
Yao, Yunxi0000-0002-0814-6675
Giapis, Konstantinos P.0000-0002-7393-298X
Additional Information:© 2016 Wiley-VCH Verlag GmbH & Co. Accepted manuscript online: 16 Feb 2016. Manuscript Accepted: 12 Feb 2016. Manuscript Revised: 11 Feb 2016. Manuscript Received: 14 Jan 2016. Funding support from the National Science Foundation is gratefully acknowledged (Award number 1202567).
Funding AgencyGrant Number
Subject Keywords:charge exchange;low energy ion scattering;work function;surface dynamics
Issue or Number:10
Record Number:CaltechAUTHORS:20160222-144143554
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Official Citation:Y. Yao, K. P. Giapis, ChemPhysChem 2016, 17, 1430.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64649
Deposited By: Ruth Sustaita
Deposited On:22 Feb 2016 23:20
Last Modified:09 Mar 2020 13:19

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