skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Gas chromatography/matrix-isolation apparatus

Abstract

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 bymore » 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.« less

Inventors:
Publication Date:
OSTI Identifier:
7004311
Patent Number(s):
US 4594226; A
Application Number:
PPN: US 6-583042
Assignee:
PTO; EDB-94-124744
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Patent
Resource Relation:
Patent File Date: 23 Feb 1984
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, 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

Citation Formats

Reedy, G T. Gas chromatography/matrix-isolation apparatus. United States: N. p., 1986. Web.
Reedy, G T. Gas chromatography/matrix-isolation apparatus. United States.
Reedy, G T. 1986. "Gas chromatography/matrix-isolation apparatus". United States.
@article{osti_7004311,
title = {Gas chromatography/matrix-isolation apparatus},
author = {Reedy, G T},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/7004311}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jun 10 00:00:00 EDT 1986},
month = {Tue Jun 10 00:00:00 EDT 1986}
}