Determining molecule diffusion coefficients on surfaces from a locally fixed probe: Analysis of signal fluctuations

Autor(en): Hahne, Susanne
Ikonomov, Julian
Sokolowski, Moritz
Maass, Philipp 
Stichwörter: ADSORBATES; Materials Science; Materials Science, Multidisciplinary; NOISE; Physics; Physics, Applied; Physics, Condensed Matter; STM
Erscheinungsdatum: 2013
Herausgeber: AMER PHYSICAL SOC
Journal: PHYSICAL REVIEW B
Volumen: 87
Ausgabe: 8
Zusammenfassung: 
Methods of determining surface diffusion coefficients of molecules from signal fluctuations of a locally fixed probe are revisited and refined. Particular emphasis is put on the influence of the molecule's extent. In addition to the formerly introduced autocorrelation method and residence time method, we develop a further method based on the distribution of intervals between successive peaks in the signal. The theoretical findings are applied to scanning tunneling microscopy measurements of copper phthalocyanine (CuPc) molecules on the Ag(100) surface. We discuss advantages and disadvantages of each method and suggest a combination to obtain accurate results for diffusion coefficients. DOI: 10.1103/PhysRevB.87.085409
ISSN: 24699950
DOI: 10.1103/PhysRevB.87.085409

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