Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

A Pulsed Laval Nozzle Apparatus With Laser Ionization Mass Spectroscopy for Direct Measurements of Rate Coefficients at Low Temperatures With Condensable Gases

Published

Author(s)

S Lee, R J. Hoobler, S R. Leone

Abstract

A pulsed Laval nozzle, low Mach number supersonic expanison kinetics apparatus has been constructed to study neutral-neutral kinetics by a rather general laser photolysis initiation and laser photoionization detection of the product species. This new apparatus permits laboratory studies of low temperature rate coefficients (e.g., 70-170K) on condensable gases that have insufficient vapor pressures at low temperatures for conventional methods of kinetic measurements. The design considerations, the uniformity of the reaction zone over 10-20 cm, and the skimer sampling of the pulsed Laval expansion are examined. The direct measurement of a rate coefficient at 90 K is also demonstrated using this new apparatus.
Citation
Review of Scientific Instruments
Volume
71
Issue
No. 4

Keywords

laval nozzle, low temperature kinetics

Citation

Lee, S. , Hoobler, R. and Leone, S. (2000), A Pulsed Laval Nozzle Apparatus With Laser Ionization Mass Spectroscopy for Direct Measurements of Rate Coefficients at Low Temperatures With Condensable Gases, Review of Scientific Instruments (Accessed July 15, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created March 31, 2000, Updated October 12, 2021