THE ON-LINE CHEMICAL ANALYSIS OF SINGLE PARTICLES USING AEROSOL BEAMS AND TIME OF FLIGHT MASS SPECTROMETRY
作者:
O. KIEVIT,
M. WEISS,
P. J. T. VERHEIJEN,
J. C. M. MARIJNISSEN,
B. SCARLETT,
期刊:
Chemical Engineering Communications
(Taylor Available online 1996)
卷期:
Volume 151,
issue 1
页码: 79-100
ISSN:0098-6445
年代: 1996
DOI:10.1080/00986449608936543
出版商: Taylor & Francis Group
关键词: Chemical analysis;Photo-ionization;Aerosol beam;Time-of-flight mass spectrometry
数据来源: Taylor
摘要:
This paper describes an on-line instrument, capable of measuring the size and chemical composition of single, aerosol particles. Possible applications include monitoring aerosol reactors and studying atmospheric chemistry. The main conclusion is that a working prototype has been built and tested. It uses a three stage vacuum system to generate an aerosol beam with a low divergence angle and a high transmittance. The pressure is reduced sufficiently to allow the application of a time-of-flight mass analyzer. The aerosol beam is probed in the analysis section by the focused beam of a low-power helium-neon laser. Every particle crossing the laser beam scatters light, which is detected by two photomultiplier tubes, mounted at angles of 45 and 90°. The signal is stored when both detectors produce a pulse simultaneously, and this event triggers the chemical analysis cycle. A pulsed Nd: YAG laser vaporizes the particle and generates ions, which are next analyzed by a time-of-flight mass spectrometer. In this way combined information on the size and the composition of the particle is obtained.
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