Neutralization of H^– near vicinal metal surfaces

Abstract

References (32)

Citing Articles

Download: PDF (541 kB) or Buy this Article (US$25) (Use Article Pack)

Boyan Obreshkov and Uwe Thumm
James R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506-2604, USA

Received 3 March 2006; revised 31 May 2006; published 19 July 2006

Wecalculate the neutralization probability of H^– ions due to chargetransfer in collisions with metal vicinal surfaces. We apply astatistical Thomas-Fermi model with gradient correction to the kinetic energyand a local density approximation for the exchange-correlation energy tocompute the ground-state electronic structure of the surface. In comparisonwith calculations for flat surfaces, we find work-function changes, inducedby the vicinal superstructure, in good agreement with published experimentaland theoretical data. We evaluate the shift and width ofthe H^– affinity level resonance for fixed positions of theion near the surface. For incident anions with a kineticenergy of 1 keV, the calculated ion-neutralization probabilities depend sensitively onthe impact direction, point of closest approach of the trajectory,and the surface morphology. We find that the ion survivalis more likely if the H^– ions approach the stepfrom above, as compared to ions that approach a stepfrom below under otherwise identical scattering conditions. In particular, theelectron loss after reflection at a terrace of a monoatomicallystepped Al surface is predicted to be resonantly enhanced ifthe ion approaches a step from below.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.74.012901
DOI:	10.1103/PhysRevA.74.012901
PACS:	79.20.Rf; 73.22.-f; 34.70.+e; 71.15.Mb 79.20.Rf Atomic, molecular, and ion beam impact and interactions with surfaces 73.22.-f Electronic structure of nanoscale materials including clusters, nanoparticles, nanotubes, and nanocrystals 34.70.+e Charge transfer (atoms and molecules) 71.15.Mb Density functional theory, local density approximation, gradient and other corrections (condensed matter electronic structure) YEAR: 2006
KEYWORDS:	hydrogen ions, aluminium, ion-surface impact, charge exchange, Thomas-Fermi model, density functional theory, electron correlations, surface states, work function, surface morphology

REFERENCES (32)

View in Separate Window/Tab

For access to fully linked references, you need to log in. For access to fully linked references, you need to Log in.

L. Guillemot and V. A. Esaulov, Phys. Rev. Lett. 82, 4552 (1999).
P. Nordlander and J. C. Tully, Phys. Rev. Lett. 61, 990 (1998).
P. Kürpick and U. Thumm, Phys. Rev. A 58, 2174 (1998).
A. G. Borisov, A. K. Kazansky, and J. P. Gauyacq, Phys. Rev. B 59, 10935 (1999).
H. Chakraborty, T. Niederhausen, and U. Thumm, Phys. Rev. A 70, 052903 (2004).
A. Murgaza, A. Mascaraque, V. Pérez-Dieste, V. Repain, S. Rousset, F. J. García de Abajo, and J. E. Ortega, Phys. Rev. Lett. 87, 107601 (2001).
F. Schiller, M. Ruiz-Osés, J. Cordón, and J. E. Ortega, Phys. Rev. Lett. 95, 066805 (2005).
C. C. Hsu, H. Bu, A. Bousetta, J. W. Rabalais, and P. Nordlander, Phys. Rev. Lett. 69, 188 (1992).
L. Houssiau, J. W. Rabalais, J. Wolfgang, and P. Nordlander, Phys. Rev. Lett. 81, 5153 (1998).
C. A. Utreras-Diaz, Phys. Rev. B 36, 1785 (1987).
A. Chizmeshya and E. Zaremba, Phys. Rev. B 37, 2805 (1988).
J. S. Cohen and G. Fiorentini, Phys. Rev. A 33, 1590 (1986).
P. J. Jennings, R. O. Jones, and M. Weinert, Phys. Rev. B 37, 6113 (1998).
R. Smoluchowski, Phys. Rev. 60, 661 (1941).
J. Y. Park, G. M. Sacha, M. Enachescu, D. F. Ogletree, R. A. RiBeiro, P. C. Canfield, C. J. Jenks, P. A. Thiel, J. J. Sáenz, and M. Salmeron, Phys. Rev. Lett. 95, 136802 (2005).
H. Ishida and A. Liebsch, Phys. Rev. B 46, 7153 (1992).
M. Taylor and P. Nordlander, Phys. Rev. B 64, 115422 (2001).