Münster 1999 – scientific programme

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CP: Chemische Physik

CP 32: Poster: Einzelteilchenspektroskopie

CP 32.8: Poster

Monday, March 22, 1999, 18:00–20:00, R52/R72

Single Molecule Absorption Spectra Detected by RF Stark Modulation — •Tatiana Latychevskaia¹, Lothar Kador², Alois Renn¹, and Urs P. Wild¹ — ¹Physical Chemistry Laboratory, ETH-Zurich, CH-8092 Zurich — ²Physical Institute and "Bayreuther Institut fuer Makromolekuelforschung", University of Bayreuth, D-95447 Bayreuth

We present a new technique for the detection of single molecule

absorption lines using a radio frequency (RF) modulated

electric field applied directly to the sample. RF Stark

modulation of the single molecule lines can be regarded as

a kind of an inverse frequency modulation (FM) experiment in

which the transition dipole of the molecule rather than the

laser light is phase-modulated. The technique is demonstrated

for the systems terrylene in naphthalene and terrylene in

hexadecane. The dependence of the absorption line on the

modulation frequency and the RF electric field amplitude is

measured and described. The signal to noise ratio and possible

applications of the absorption technique will be discussed.