Berlin 2005 – wissenschaftliches Programm

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MO: Molekülphysik

MO 23: Femtosecond Spectroscopy

MO 23.5: Vortrag

Samstag, 5. März 2005, 15:00–15:15, HU 2091

Direct measurement of the group velocity mismatch and derivation of the refractive index dispersion for solvents in the ultraviolet — •Ida Z. Kozma, Patrizia Krok, and Eberhard Riedle — LS für BioMolekulare Optik, Ludwig-Maxilimians-Universität München

In order to predict the group velocity mismatch (GVM) between interacting pulses the wavelength dependence of the refractive index of the medium must be known. The GVM is crucial for the temporal resolution that can be obtained in an ultrafast experiment. Data are hardly available in the literature and their accurate measurement remains a challenge especially in the UV. A new method for use in the UV was developed for the direct measurement of the GVM. It is based on a standard pump probe arrangement with a sample of considerable thickness, making the precise determination of the GVM possible. From the measured wavelength dependence of the GVM the refractive index dispersion can be determined. To illustrate the accuracy of the method we measured the GVM of water because its refractive index dispersion is well documented in the literature. Our experimental results show a good agreement with reported data. The GVM was measured and dispersion formulae were derived in the 230 to 640 nm spectral range for eleven solvents, supplying data useful for the most common spectroscopic situations.