Potential dependence of the non-linear polarizability of an Au(110) electrode

Abstract

The second harmonic generation (SHG) anisotropy of an Au(110) electrode has been studied over a wide potential range varying from -600 mV, where the surface is micro-faceted, to the unreconstructed surface at 600 mV. The interference SHG anisotropy (ISHGA), a new approach which allows one to measure directly the non-linear polarizability of the surface was used. The potential dependence of the symmetry components is discussed. A previously proposed model for the anisotropy of the Au(110) surface could be confirmed. Though rather weak, a quadrupole contribution has also been measured, showing a significant potential dependence.

References

1. D. M. Kolb and J. Schneider, Electrochim. Acta, 1986, 31, 929.
2. J. V. Barth, H. Brune, G. Ertl and R. J. Behm, Phys. Rev. B, 1990, 42, 9307.
3. D. M. Kolb, Prog. Surf. Sci., 1996, 51, 109.
4. B. M. Ocko, G. Helgesen, B. Schardt, J. Wang and A. Hamelin, Phys. Rev. Lett., 1992, 69, 3350.
5. A. Hamelin, Z. Phys. IV, 1994, 4, 315.
6. O. M. Magnussen, J. Wiechers and R. J. Behm, Surf. Sci., 1993, 289, 139.
7. X. Gao, G. J. Edens, A. Hamelin and M. J. Weaver, Surf. Sci., 1994, 318, 1.
8. X. Gao, G. J. Edens and M. J. Weaver, J. Electroanal. Chem., 1994, 376, 21.
9. X. Gao, A. Hamelin and M. J. Weaver, Phys. Rev., B, 1991, 44, 10 983.
10. X. Gao and M. J. Weaver, Ber. Bunsen-Ges. Phys. Chem., 1993, 97, 507.
11. B. Pettinger, S. Mirwald and J. Lipkowski, Appl. Phys. A, 1995, 60, 121.
12. B. Pettinger and C. Bilger, Chem. Phys. Lett., 1998, 286, 355.
13. C. D. Keefe, E. Revesz, M. Dionne and M. Morin, Can. J. Chem., 1997, 75, 449.
14. C. Bilger and B. Pettinger, Chem. Phys. Lett., in press.
15. J. E. Sipe, D. J. Moss and H. M. van Driel, Phys. Rev. B, 1987, 35, 1129.
16. Y. R. Shen, The Principles of Nonlinear Optics, Wiley, New York, 1984.
17. P. Guyot-Sionnest and Y. R. Shen, Phys. Rev. B, 1987, 35, 4420.
18. J. E. Sipe, V. Mizrahi and G. I. Stegeman, Phys. Rev. B, 1987, 35, 9091.
19. P. Guyot-Sionnest and Y. R. Shen, Phys. Rev. B, 1988, 38, 7985.
20. D. A. Koos, V. L. Shannon and G. L. Richmond, Phys. Rev. B, 1993, 47, 4730.