Gas chromatography/matrix-isolation apparatus

Title: Gas chromatography/matrix-isolation apparatus

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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 »« less

Inventors:

Reedy, Gerald T ^[1]

411 Francis St., Bourbonnais, IL 60914

Issue Date:: 1986-01-01

Research Org.:: Argonne National Lab. (ANL), Argonne, IL (United States)

OSTI Identifier:: 865876

Patent Number(s):: 4594226

Assignee:: Reedy, Gerald T. (411 Francis St., Bourbonnais, IL 60914)

Patent Classifications (CPCs):: G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES

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G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N30/74 - Optical detectors {
G01N21/8422 - {Investigating thin films, e.g. matrix isolation method}
G01N21/3504 - for analysing gases, e.g. multi-gas analysis
G01N2030/8417 - {the store moving as a whole, e.g. moving wire}

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DOE Contract Number:: W-31109-ENG-38

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: gas; chromatography; matrix-isolation; apparatus; gas-sample; collection; device; provides; matrix; isolation; individual; bands; chromatographic; separation; spectroscopic; analysis; sample; vacuum; chamber; containing; rotatably; supported; specular; carousel; reflecting; surface; holding; deposited; thereon; inlet; provided; depositing; mixture; material; maintained; sufficiently; temperature; solidification; parabolic; mirror; directs; incident; beam; electromagnetic; radiation; infrared; spectrum; source; reflected; spectrometer; determining; absorption; spectra; pair; off-axis; mirrors; common; focal; positioned; outside; displaced; combination; improved; positioning; alignment; aperture; facilitate; accurate; relative; gas-samples; deposition; insured; length; stereomicroscope; monitoring; formation; window; collector; zone; bounded; beams; access; beam position; material deposited; common focal; sample collector; rotatably supported; beam relative; individual gas; device provides; collection device; focal length; spectroscopic analysis; gas chromatography; sample collection; matrix material; gas inlet; vacuum chamber; electromagnetic radiation; reflecting surface; chamber containing; deposited thereon; gas chromatograph; incident beam; positioned outside; chromatographic separation; absorption spectra; sample material; radiation reflected; gas chromatographic; improved gas; matrix isolation; sample deposited; gas-sample collection; specular surface; gas bands; individual sample; improved sample; monitoring sample; sample band; accurate position; /422/250/

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                    Reedy, Gerald T. Gas chromatography/matrix-isolation apparatus.  United States: N. p., 1986. 
        Web.

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                    Reedy, Gerald T. Gas chromatography/matrix-isolation apparatus.  United States.

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                    Reedy, Gerald T. Wed .  
        "Gas chromatography/matrix-isolation apparatus".  United States.  https://www.osti.gov/servlets/purl/865876.

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@article{osti_865876,

  title        = {Gas chromatography/matrix-isolation apparatus},

  author       = {Reedy, Gerald 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.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1986},

  month        = {1}

}

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