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Title: Detection system for a gas chromatograph. [. cap alpha. -methylnaphthalene,. beta. -methylnapthalene]

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. 3 figures, 2 tables.

Inventors:
;
Issue Date:
OSTI Identifier:
6582887
Application Number:
ON: DE83006897
Assignee:
ERA-08-018328; EDB-83-050933
DOE Contract Number:  
W-7405-ENG-82
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; NAPHTHALENE; FLUORESCENCE; GAS CHROMATOGRAPHY; POLYCYCLIC AROMATIC HYDROCARBONS; CHEMICAL ANALYSIS; DESIGN; EQUIPMENT; EXPERIMENTAL DATA; LASER RADIATION; PETROLEUM; QUANTITATIVE CHEMICAL ANALYSIS; AROMATICS; CHROMATOGRAPHY; CONDENSED AROMATICS; DATA; ELECTROMAGNETIC RADIATION; ENERGY SOURCES; FOSSIL FUELS; FUELS; HYDROCARBONS; INFORMATION; LUMINESCENCE; NUMERICAL DATA; ORGANIC COMPOUNDS; RADIATIONS; SEPARATION PROCESSES 400104* -- Spectral Procedures-- (-1987)

Citation Formats

Hayes, J.M., and Small, G.J. Detection system for a gas chromatograph. [. cap alpha. -methylnaphthalene,. beta. -methylnapthalene]. United States: N. p., 1982. Web.
Hayes, J.M., & Small, G.J. Detection system for a gas chromatograph. [. cap alpha. -methylnaphthalene,. beta. -methylnapthalene]. United States.
Hayes, J.M., and Small, G.J. Mon . "Detection system for a gas chromatograph. [. cap alpha. -methylnaphthalene,. beta. -methylnapthalene]". United States.
@article{osti_6582887,
title = {Detection system for a gas chromatograph. [. cap alpha. -methylnaphthalene,. beta. -methylnapthalene]},
author = {Hayes, J.M. and Small, G.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. 3 figures, 2 tables.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1982},
month = {4}
}