Photoinduced nucleation: A novel tool for detecting molecules in air at ultra-low concentrations

Autor:	Heikki Lihavainen, Joseph L. Katz, Markus M. Rudek, Brian C. Salter
Rok vydání:	2000
Předmět:	Range (particle radiation) Supersaturation Chemistry Scattering Condensation Analytical chemistry Nucleation General Physics and Astronomy Chemical reaction Light scattering Wavelength Physics::Atomic Physics Physical and Theoretical Chemistry Physics::Atmospheric and Oceanic Physics
Zdroj:	The Journal of Chemical Physics. 112:8363-8366
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.481441
Popis:	A method and apparatus for determining the presence of molecules in a gas at concentrations of less than about 100 ppb. Light having wavelengths in the range from about 200 nm to about 350 nm is used to illuminate a flowing sample of the gas causing the molecules if present to form clusters. A mixture of the illuminated gas and a vapor is cooled until the vapor is supersaturated so that there is a small rate of homogeneous nucleation. The supersaturated vapor condenses on the clusters thus causing the clusters to grow to a size sufficient to be counted by light scattering and then the clusters are counted.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::73417b25521c1cc4be9058b3642f809a https://doi.org/10.1063/1.481441 Zobrazit plný text záznamu