Supersonic jet fluorescence spectrometry of perylene and benzo[a]pyrene |
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Authors: | Totaro Imasaka Hiromi Fukuoka Toshinori Hayashi Nobuhiko Ishibashi |
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Institution: | Faculty of Engineering, Kyushu University, Hakozaki, Fukuoka 812 Japan |
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Abstract: | A supersonic jet instrument for fluorescence spectrometry is described. It consists of a high-temperature free expansion nozzle for continuous sample introduction and a vacuum chamber equipped with a high-speed pumping system. Rotationally cooled spectra obtained with the supersonic jet are compared with gas-phase spectra measured at high temperature for perylene and benzoa]pyrene molecules. Each component of the unresolved band structure in the high-temperature spectra was found to be composed of a rotational congestion of several vibrational bands. For a 1:1 mixture of perylene and benzoa]pyrene, selective detection is possible by using supersonic jet spectrometry. The detection limit for perylene is 100 ng. The advantage of this technique over other low-temperature spectrometric methods based on Shpol'skii and matrix isolation effects are discussed. |
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