Abstract
We have measured the polarization of light emitted after ion surface scattering at small angle of incidence. The measurements are carried out with H+-, H +2 - and He+-ions under UHV-conditions with mono- and polycrystalline targets. We explain the typical variation of the polarization as “post collision Stark interaction” (PCSI) in the surface electric field, which can force transitions between nearly degenerate terms. The electric field is composed of two different contributions, a strong but short range surface field which is “seen” by atomsand ions and a long range but weak field due to the image charge which is “seen” to first orderonly by ions. The influence of the electric field on H-Balmer radiation is negligible at typical survival distances rs≧0.35nm. But in contrast to H-atoms He+-ions feel the additional influence of the image field leading to a strong alteration of the polarization of the emitted light. The polarization of the Balmer-radiation stemming from Coulomb exploding H +2 -beams is observed to be modified by the electric field of the “spectator proton”.
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We wish to thank R. Burghardt, D. Ellendt, A. Hensel and J. Thiel for their technical support during the building up of the UHV-apparatus. We gratefully acknowledge the great skill, with which W. Becker (Freie Universität Berlin) prepared the Cu- and Au-target.
Further, we thank Prof. W. Heiland and his coworkers (Universität Osnabrück) for their excellent surface polishing of the Ni crystal. Many fruitful discussions with J. Burgdörfer, N. Kirchner, E. Kupfer, H.J. Plöhn and H. Schröder are gratefully acknowledged.
This work was supported by the Sonderforschungsbereich 161 der Deutschen Forschungsgemeinschaft.
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Fröhling, R., Andrä, H.J. Influence of the surface electric field in ion-beam-surface interaction at grazing incidence. Z Physik A 320, 207–223 (1985). https://doi.org/10.1007/BF01881268
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DOI: https://doi.org/10.1007/BF01881268