EXAFS- and XANES-like spectra obtained by x-ray-excited scanning tunneling microscope tip current measurement
✍ Scribed by Tsuji, Kouichi; Wagatsuma, Kazuaki; Sugiyama, Kazuaki; Hiraga, Kenji; Waseda, Yoshio
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 195 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0142-2421
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✦ Synopsis
As reported previously the tip current of a scanning tunneling microscope (STM) is excited by irradiation of x-rays on the sample. This x-ray-excited STM tip current originates from electrons emitted from the sample surface. We measured the STM tip current excited by synchrotron radiation for Au-Ni thin-Ðlm samples as the x-ray energy was scanned near the Au L III and Ni K absorption edges. It was found that the STM tip current increased at the x-ray energy near the absorption edge and extended x-ray adsorption Ðne structure (EXAFS)-like and x-ray adsorption near-edge structure (XANES)-like spectra were obtained. The experimental result using the tip coated with insulator suggested that the analysing area was ¿1.0 mm in diameter.