Development of high-temperature pulsed slit nozzle and its application to supersonic jet absorption spectrometry

Shin'ichiro Kawamura, Cheng-Huang Lin, Totaro Imasaka

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A high-temperature pulsed slit nozzle, consisting of a circular pulsed nozzle and an interface to convert a circular flow into a slit flow has been constructed. The absorption spectrum is measured by scanning the wavelength of the monochromator equipped with a xenon arc lamp and by detecting the transmitted light through a jet with a photomultiplier. A rotationally cooled spectrum is clearly observed for aniline only when a long slit nozzle is employed. The absorptivity increases proportionally to the slit length at least up to 6 cm. The time for recording a spectrum is 3.5 min, which is reduced to several seconds by transmitting a white light through a jet and by measuring the spectrum with an optical multichannel analyzer. The detection limit is estimated to a partial vapor pressure of 0.4 torr for aniline. The present system can be conveniently used in routine analysis, because of a wide spectral coverage of the lamp source.

Original languageEnglish
Pages (from-to)1933-1936
Number of pages4
Issue number11
Publication statusPublished - 1994 Jan 1


ASJC Scopus subject areas

  • Analytical Chemistry

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