A pulsed Laval nozzle apparatus with laser ionization mass spectroscopy for direct measurements of rate coefficients at low temperatures with condensable gases

Autor:	Seonkyung Lee, Stephen R. Leone, Ray Hoobler
Rok vydání:	2000
Předmět:	Materials science Nozzle Analytical chemistry Photoionization Laser Mass spectrometry law.invention symbols.namesake Nuclear magnetic resonance Mach number law symbols Supersonic speed Spectroscopy Instrumentation Choked flow
Zdroj:	Review of Scientific Instruments. 71:1816-1823
ISSN:	1089-7623 0034-6748
DOI:	10.1063/1.1150542
Popis:	A pulsed Laval nozzle, low Mach number supersonic expansion 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., 70–170 K) 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 skimmer 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4554f91d9ba69ccf79365cbfc715b956 https://doi.org/10.1063/1.1150542 Zobrazit plný text záznamu