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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 16, Number 3
BKCSDE 16(3)
March 20, 1995 

Time Resolved Molecular Beam Characteristic in a Pulsed Supersonic Jet
Wee Kyung Kang, Eun Jeong Kim, Chang Ju Choi, Kwang Woo Jung, Kyung-Hoon Jung*
A pulsed molecular beam source having short pulse duration (typically 70 μs) and narrow velocity distribution (Δv/v=8% for helium) has been costructed utilizing a commercial fuel injector. Beam characteristics of helium and ammonia seeded in helium expansions are accomplished by the use of an electron impact time-or-flight mass spectrometer. The comparisons between experimental data and theoretical calculations show that the proper beam speed is important to predict the evolution of stream temperature and valve shutter function. The decreasing tendency of pulse duration with increasing cluster size leads to the conclusion that the cluster beam property is described as a function of cluster mass and disinct cluster temperature.
238 - 243
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