title: Development of high-temperature pulsed slit nozzle and its application to supersonic jet absorption spectrometry.
abstract: 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.
authors.affiliation: Faculty of Engineering, Kyushu University, Hakozaki, Fukuoka, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Kawamura
authors.forename: C H
authors.initials: CH
authors.lastname: Lin
authors.forename: T
authors.initials: T
authors.lastname: Imasaka