发明名称 |
Photoinduced nucleation: a novel tool for detecting molecules in air at ultra-low concentrations |
摘要 |
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.
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申请公布号 |
US6469781(B1) |
申请公布日期 |
2002.10.22 |
申请号 |
US20000629468 |
申请日期 |
2000.08.01 |
申请人 |
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE UNITED STATES DEPARTMENT OF ENERGY |
发明人 |
KATZ JOSEPH L.;LIHAVAINEN HEIKKI;RUDEK MARKUS M.;SALTER BRIAN C. |
分类号 |
G01N1/00;G01N1/28;G01N21/33;G01N21/53;G01N33/00;(IPC1-7):G01N1/00 |
主分类号 |
G01N1/00 |
代理机构 |
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地址 |
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