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Title: Detection system for a gas chromatograph

Abstract

A method and apparatus are described for the quantitative analysis of vaporizable compounds, and in particular of polycyclic aromatic hydrocarbons which may be induced to fluoresce. The sample to be analyzed is injected into a gas chromatography column and is eluted through a narrow orifice into a vacuum chamber. The free expansion of the eluted sample into the vacuum chamber creates a supersonic molecular beam in which the sample molecules are cooled to the extent that the excited vibrational and rotational levels are substantially depopulated. The cooled molecules, when induced to fluoresce by laser excitation, give greatly simplified spectra suitable for analytical purposes. The laser induced fluorimetry provides great selectivity, and the gas chromatograph provides quantitative transfer of the sample to the molecular beam.

Inventors:
 [1];  [1]
  1. Ames, IA
Issue Date:
Research Org.:
Ames Lab., Ames, IA (United States); Iowa State University, Ames, IA (US)
OSTI Identifier:
864888
Patent Number(s):
4432225
Assignee:
United States of America as represented by United States (Washington, DC)
DOE Contract Number:  
W-7405-ENG-82
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
detection; gas; chromatograph; method; apparatus; described; quantitative; analysis; vaporizable; compounds; particular; polycyclic; aromatic; hydrocarbons; induced; fluoresce; sample; analyzed; injected; chromatography; column; eluted; narrow; orifice; vacuum; chamber; free; expansion; creates; supersonic; molecular; beam; molecules; cooled; extent; excited; vibrational; rotational; levels; substantially; depopulated; laser; excitation; greatly; simplified; spectra; suitable; analytical; purposes; fluorimetry; provides; selectivity; transfer; aromatic hydrocarbons; quantitative analysis; gas chromatography; vacuum chamber; molecular beam; gas chromatograph; aromatic hydrocarbon; laser induced; chromatography column; laser excitation; polycyclic aromatic; chamber creates; free expansion; /73/250/

Citation Formats

Hayes, John M, and Small, Gerald J. Detection system for a gas chromatograph. United States: N. p., 1984. Web.
Hayes, John M, & Small, Gerald J. Detection system for a gas chromatograph. United States.
Hayes, John M, and Small, Gerald J. Sun . "Detection system for a gas chromatograph". United States. https://www.osti.gov/servlets/purl/864888.
@article{osti_864888,
title = {Detection system for a gas chromatograph},
author = {Hayes, John M and Small, Gerald J},
abstractNote = {A method and apparatus are described for the quantitative analysis of vaporizable compounds, and in particular of polycyclic aromatic hydrocarbons which may be induced to fluoresce. The sample to be analyzed is injected into a gas chromatography column and is eluted through a narrow orifice into a vacuum chamber. The free expansion of the eluted sample into the vacuum chamber creates a supersonic molecular beam in which the sample molecules are cooled to the extent that the excited vibrational and rotational levels are substantially depopulated. The cooled molecules, when induced to fluoresce by laser excitation, give greatly simplified spectra suitable for analytical purposes. The laser induced fluorimetry provides great selectivity, and the gas chromatograph provides quantitative transfer of the sample to the molecular beam.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {1}
}

Patent:

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