Detection system for a gas chromatograph. [. cap alpha. -methylnaphthalene,. beta. -methylnapthalene]
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.
- DOE Contract Number:
- W-7405-ENG-82
- Assignee:
- ERA-08-018328; EDB-83-050933
- Patent Number(s):
- None
- Application Number:
- ON: DE83006897
- OSTI ID:
- 6582887
- Country of Publication:
- United States
- Language:
- English
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Detection system for a gas chromotograph
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Related Subjects
400104* -- Spectral Procedures-- (-1987)
AROMATICS
CHEMICAL ANALYSIS
CHROMATOGRAPHY
CONDENSED AROMATICS
DATA
DESIGN
ELECTROMAGNETIC RADIATION
ENERGY SOURCES
EQUIPMENT
EXPERIMENTAL DATA
FLUORESCENCE
FOSSIL FUELS
FUELS
GAS CHROMATOGRAPHY
HYDROCARBONS
INFORMATION
LASER RADIATION
LUMINESCENCE
NAPHTHALENE
NUMERICAL DATA
ORGANIC COMPOUNDS
PETROLEUM
POLYCYCLIC AROMATIC HYDROCARBONS
QUANTITATIVE CHEMICAL ANALYSIS
RADIATIONS
SEPARATION PROCESSES