Gas chromatography/matrix-isolation apparatus
A gas-sample collection device provides matrix isolation of individual gas bands from a gas chromatographic separation and for the spectroscopic analysis of the individual sample bands. The device includes a vacuum chamber containing a rotatably supported, specular carousel having at least one reflecting surface for holding a sample deposited thereon. A gas inlet is provided for depositing a mixture of sample and matrix material on the reflecting surface which is maintained at a sufficiently low temperature to cause solidification. A first parabolic mirror directs an incident beam of electromagnetic radiation, such as in the infrared (IR) spectrum, from a source onto the sample/matrix mixture while a second parabolic mirror directs a second beam of electromagnetic radiation reflected by the specular surface to an IR spectrometer for determining the absorption spectra of the sample material deposited on the reflecting surface. The pair of off-axis parabolic mirrors having a common focal point are positioned outside of the vacuum chamber and may be displaced in combination for improved beam positioning and alignment. The carousel is provided with an aperture for each reflecting surface to facilitate accurate positioning of the incident beam relative to the gas-samples under analysis. Improved gas-sample deposition is insured by the use of a long focal length stereomicroscope positioned outside of the vacuum chamber for monitoring sample formation through a window, while the sample collector is positioned outside of the zone bounded by the incident and reflected electromagnetic beams for improved sample access and monitoring. 10 figs.
- DOE Contract Number:
- W-31109-ENG-38
- Assignee:
- PTO; EDB-94-124744
- Patent Number(s):
- US 4594226; A
- Application Number:
- PPN: US 6-583042
- OSTI ID:
- 7004311
- Resource Relation:
- Patent File Date: 23 Feb 1984
- Country of Publication:
- United States
- Language:
- English
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Device for collecting and analyzing matrix-isolated samples. [DOE patent]
Device for collecting and analyzing matrix-isolated samples
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
EXTRACTION COLUMNS
EQUIPMENT INTERFACES
GASES
ABSORPTION SPECTROSCOPY
GAS CHROMATOGRAPHY
INFRARED SPECTROMETERS
SAMPLE HOLDERS
DESIGN
INFRARED RADIATION
MATRIX MATERIALS
MIRRORS
OPERATION
CHROMATOGRAPHY
ELECTROMAGNETIC RADIATION
EXTRACTION APPARATUSES
FLUIDS
MATERIALS
MEASURING INSTRUMENTS
RADIATIONS
SEPARATION EQUIPMENT
SEPARATION PROCESSES
SPECTROMETERS
SPECTROSCOPY
400102* - Chemical & Spectral Procedures
400105 - Separation Procedures