Osnabrück 2002 – scientific programme
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MO: Molekülphysik
MO 7: Poster I (Experimentelle Techniken, Spektroskopie, Cluster)
MO 7.7: Poster
Wednesday, March 6, 2002, 11:00–13:00, Schloss
Investigation of enhancement effects of Raman spectra by a laser irradiated STM tip at the single molecule level — •Stefan Klein1, Tobias Witting1, Arend von der Lieth1, Klaus Dickmann1, Pavel Geshev2, and Michael Hietschold3 — 1Lasercenter, University of Applied Sciences Münster, Engineering Physics, Stegerwaldstr. 39, D - 48565 Steinfurt, Germany — 2Institute of Thermophysics of Russian Acadmey of Sciences, Lavrentyev Ave. 1, 630 090 Novosibirsk, Russia — 3Technical University Chemnitz, Institute of Physics, Solid Surfaces Analysis Group, D - 09107 Chemnitz, Germany
Single molecule spectroscopy (SMS) has attracted much attention in recent years. Since Betzig and Chichester observed single molecules at room temperature for the first time by a near-field fluorescence microscope in 1993, a vast amount of studies followed and SMS emerged to be a subject of high interest. Nowadays the fluorescence of single molecules is mainly studied. So far as known single molecule Raman spectroscopy (SMRS) has only been experimentally investigated by Kneipp et al. Lately also Stöckle et al. and Pettinger et al. achieved enhanced Raman spectra at the single molecule level by combining SPM technologies (atomic force (AFM) as also scanning tunneling microcopy (STM) respectively) and optical spectroscopy.
In the frame of our experiments, we investigate the enhancement of Raman spectra of molecules located in the near field of a STM tip. First experimental results and theoretical simulations of the setup and the distribution of electric field are presented.