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Volumn 315, Issue 5820, 2007, Pages 1824-1828

Ballistic electron microscopy of individual molecules

Author keywords

[No Author keywords available]

Indexed keywords

BISMUTH; FULLERENE; ORGANIC COMPOUND; SILICON;

EID: 34147192999     PISSN: 00368075     EISSN: 10959203     Source Type: Journal    
DOI: 10.1126/science.1138668     Document Type: Article
Times cited : (44)

References (40)
  • 15
    • 0037071635 scopus 로고    scopus 로고
    • J. Park et al., Nature 417, 722 (2002).
    • (2002) Nature , vol.417 , pp. 722
    • Park, J.1
  • 26
    • 34147199055 scopus 로고    scopus 로고
    • The experiments were performed at a sample temperature of 130 K with the use of a commercial instrument (Nanoprobe; Omicron, Taunusstein, Germany) that was modified for the requirements of the experiment. The instrument provides three 5TM units that can be operated independently. Atomic resolution [e.g, on Bi111, can be obtained with each tip. For our experiment, one of the additional STM tips was used to gently contact the metallic bismuth layer. To conduct BEEM, we chose tunneling currents between 10 and 50 pA as a compromise between the threshold for damaging the molecular layer and a reasonable signal-to-noise ratio for the current of ballistic electrons. At a tunneling current of 50 pA, the BEEM current typically amounted to 4 pA on the clean bismuth surface, 0.5 pA for most of the C60 molecules, and 3 pA for the PTCDA molecules
    • 60 molecules, and 3 pA for the PTCDA molecules.
  • 31
    • 34147198877 scopus 로고    scopus 로고
    • 2. However, in the experiment, the total tunneling current is kept constant and the distance increases as the bias is increased. Assuming a linear dependence between the tunneling current and the bias voltage, this can be corrected by dividing by the bias voltage (or electron energy).
    • 2. However, in the experiment, the total tunneling current is kept constant and the distance increases as the bias is increased. Assuming a linear dependence between the tunneling current and the bias voltage, this can be corrected by dividing by the bias voltage (or electron energy).
  • 32
    • 1842421156 scopus 로고    scopus 로고
    • R. Yamachika, M. Grobis, A. Wachowiak, M. F. Crommie, Science 304, 281 (2004); published online 11 March 2004 (10.1126/science.1095069) .
    • R. Yamachika, M. Grobis, A. Wachowiak, M. F. Crommie, Science 304, 281 (2004); published online 11 March 2004 (10.1126/science.1095069) .
  • 40
    • 34147209800 scopus 로고    scopus 로고
    • We thank H. Nienhaus and A. Lorke for fruitful discussions. Supported by the German Research Council within Sonderforschungsbereich 616, Energy Dissipation at Surfaces
    • We thank H. Nienhaus and A. Lorke for fruitful discussions. Supported by the German Research Council within Sonderforschungsbereich 616, "Energy Dissipation at Surfaces."


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.