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2 Bulletin of the Polish Academy of Sciences. Chemistry

2 1999

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Fluorescence dynamics spectrometer of single-picosecond resolution: optimisation of experimental performance

Karolczak J., Komar D., Kubicki J., Szymański M., Wróżowa T., Maciejewski A.

Bulletin of the Polish Academy of Sciences. Chemistry

1999

Vol. 47, No. 4

361-380

Design and construction of a new spectrometer for picosecond fluorescence decay measurements by time-correlated single-photon counting is described. The use of pico/femtosecond excitation pulses from a tunable Ti: Sapphire laser in combination with a fast microchannel plate photodetector and ultrafast timing electronics resulted in an excellent temporal resolution and stability of the instrument response function (IRF) of the spectrometer which enabled successful analysis of fluorescence decay signals of single picoseconds. Results of optimisation of experimental characteristics of the system concerning the effect of the geometry of the excited region of the sample, optimum optical imaging and performance of photodetectors are presented. Test measurements of fluores-cence decay of xanthione in various solvents characterised by different S(2) state lifetimes 5-38 ps proved the excellent experimental performance of the spectrometer .

Capabilities and limits of picosecond vibrational spectroscopy

Seifert G., Graener H.

Bulletin of the Polish Academy of Sciences. Chemistry

1999

Vol. 47, No. 4

397-417

The variety of information about ultrafast processes in condensed matter that can be obtained applying picosecond vibrational spectroscopy is discussed on the example of a quite elaborate experimental setup for infrared double resonance spectroscopy; a novel comprehensive single-shot polarization analysis is described. On the basis of experimental data obtained with this system on simple liquids (CHBr(3), CDBr(3), CS(2), CC(4)) and hydrogen-bonded dimers of acetic acid (dissolved in CC4) the way of distinguishing the desired from non-desired signals and the evaluation of the results is demonstrated.