Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 63: Posters: Scanning Probe Methods

O 63.14: Poster

Mittwoch, 2. April 2014, 17:30–21:00, P2

Wavelet analysis of inelastic electron tunneling spectra — •Matthias Stocker and Berndt Koslowski — Universität Ulm, 89081 Ulm, Germany

Experiments of inelastic electron tunneling spectroscopy (IETS) are carried out typically at the absolute noise limit. Furthermore, the interpretation of such spectra - being just the second derivative of the tunneling current - is greatly hampered by contributions which do not originate from vibrational transitions. As a consequence, data evaluation occupies a central point in IETS. We developed an analysis tool which employs continuous wavelet transform on the basis of the Mexican hat mother function. The Mexican hat function is essentially the second derivative of a Gaussian peak and thus a peak function similar to the Gaussian peaks expected for vibrational transitions in IETS. This wavelet analysis helps very much in localizing and judging vibrational transitions. We introduce the new analysis and compare it to formerly developed techniques.