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

Patent · Mon Apr 26 00:00:00 EDT 1982

OSTI ID:6582887

Hayes, J M; Small, G J

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
• Application Number: ON: DE83006897
• OSTI ID: 6582887
• Country of Publication: United States
• Language: English

Related Subjects

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)