Title of article :
Investigation of the Shockley surface state on clean and air-exposed Au (1 1 1)
Author/Authors :
P.J. Kowalczyk، نويسنده , , M. Puchalski، نويسنده , , J. W. Kozlowski، نويسنده , , P. D?browski، نويسنده , , Z. Klusek، نويسنده , , W. Olejniczak، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2008
Pages :
5
From page :
4572
To page :
4576
Abstract :
Scanning tunneling microscopy (STM) and spectroscopy (STS) carried out in vacuum and air were used to study the electronic structure of the Au (1 1 1) surface in the range of 0.0–0.7 eV below the Fermi level. The STS experiment carried out in UHV showed the existence of the Shockley surface state (SS) located 0.48 eV below the Fermi level. STS carried out in air showed strong local maximum located 0.35 eV below the Fermi level. This maximum was ascribed to the SS shifted toward lower energy due to carbon and oxygen overlayer. To confirm that the SS could exist on the sample exposed to air we did ultraviolet photoemission spectroscopy (UPS) experiment on air-treated and clean Au (1 1 1). Our results suggest that the SS position initially measured at 0.38 eV below the Fermi level was shifted to 0.27 eV after air treatment. Additionally, the level of contamination was measured using X-ray photoelectron spectroscopy (XPS).
Keywords :
STS , UPS , Air treatment , Gold , Surface states
Journal title :
Applied Surface Science
Serial Year :
2008
Journal title :
Applied Surface Science
Record number :
1009203
Link To Document :
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