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Issue 11, 2004
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Absorption and fluorescence of toluene vapor at elevated temperatures

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Abstract

Absorption and fluorescence of the S0 → S1 (π,π*) transition in toluene are studied in the temperature range 300 K to 1130 K and 300 K to 930 K, respectively. Experiments are conducted in a shock-tube and in a heated flow-cell. Fluorescence spectra are investigated after excitation at 248 nm and 266 nm using a nitrogen diluent at a total pressure of 1 bar. Over the temperature range studied the fluorescence quantum yield decreases exponentially by three orders of magnitude for 266 nm excitation and double exponentially by three orders of magnitude for 248 nm excitation. The fluorescence spectrum shifts to the red with increasing temperature. The vibrational structure of the absorption spectrum found at ambient conditions vanishes above 600 K. The absorption feature broadens and the maximum shifts to the red. Taking advantage of the distinctive temperature dependence of the fluorescence, we suggest potential techniques using toluene as a sensitive tracer molecule for temperature imaging in both homogeneously and inhomogeneously mixed flow-fields.

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Publication details

The article was received on 21 Jan 2004, accepted on 02 Apr 2004 and first published on 14 Apr 2004


Article type: Paper
DOI: 10.1039/B400997E
Citation: Phys. Chem. Chem. Phys., 2004,6, 2940-2945
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    Absorption and fluorescence of toluene vapor at elevated temperatures

    W. Koban, J. D. Koch, R. K. Hanson and C. Schulz, Phys. Chem. Chem. Phys., 2004, 6, 2940
    DOI: 10.1039/B400997E

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