A Pulsed Laval Nozzle Apparatus With Laser Ionization Mass Spectroscopy for Direct Measurements of Rate Coefficients at Low Temperatures With Condensable Gases
S Lee, R J. Hoobler, S R. Leone
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.
Review of Scientific Instruments
laval nozzle, low temperature kinetics
, Hoobler, R.
and Leone, S.
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 February 23, 2024)