Zimmermann, Frank P.; Koban, W.; Roth, C.M.; Herten, D.-P.; Schulz, Christof:

Fluorescence lifetime of gas-phase toluene at elevated temperatures

In: Chem. Phys. Lett., Jg. 426 (2006) ; Nr. 4-6, S. 248-251
Zeitschriftenaufsatz / Fach: Maschinenbau
The fluorescence lifetime of toluene in the gas phase upon excitation at 248 nm was studied as a function of temp. (296-625 K) via time-correlated single-photon counting (TCSPC) in N bath gas at 1 bar total pressure. The fluorescence decay can be represented by a bi-exponential function. Lifetimes are decreasing with increasing temp., with the long lifetime component ranging from 45 to 2 ns and the short component from 2 to 0.4 ns in the studied temp. range. Results suggest high repetition-rate laser excitation of tracers like toluene in combination with TCSPC as a novel tracer-concn.-independent method for detg. gas-phase temps.