Unoccupied surface states on the (111) surface of silver: Evidence for broadening |
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| Authors: | B Reihl K H Frank A Otto |
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| Institution: | (1) IBM Zurich Research Laboratory, CH-8803 Rüschlikon, Switzerland;(2) Physikalisches Institut III, Universität Düsseldorf, Universitätsstrasse 1, D-4000 Düsseldorf 1, Federal Republic of Germany |
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| Abstract: | We have studied Ag(111) withk-resolved inverse photoemission spectroscopy athv=9.7 eV. In normal incidence we find image-state emission atE
vac–(0.4±0.1) eV and the unoccupied part of an intrinsic surface-state band as a huge emission peak cut byE
F. The energy dispersion of the intrinsic surface-state band and in particular its crossing ofE
F predicted by Ho et al. cannot be observed because of broadening effects as is shown by a theoretical simulation. The broadening is due to the vicinity of the surface state to the bulk continuum nearE
F as suggested by Kevan. |
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