Microwave spectrometer for the detection of transient gaseous species

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Description

A microwave spectrometer and associated apparatus for the detectin of unstable free radical species is described. The spectrometer, which operates over a frequency range from 66 to 73 GHz, consists of a tunable Fabry-Perot resonator followed by superhetrodyne detection for high sensitivity at low power levels. The resonator tuning is accomplished by means of a computer controlled stepping motor and by a piezoelectric transducer which also permits the use of source modulation and phase sensitive detection at 100 Hz. The sensitivity of the spectrometer is adequate to permit the detection of rotational transitions with absorption coefficients as small as 2 ... continued below

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Kolbe, W.F.; Zoellner, W.D. & Leskovar, B. June 1, 1979.

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  • Lawrence Berkeley Laboratory
    Publisher Info: California Univ., Berkeley (USA). Lawrence Berkeley Lab.
    Place of Publication: Berkeley, California

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Description

A microwave spectrometer and associated apparatus for the detectin of unstable free radical species is described. The spectrometer, which operates over a frequency range from 66 to 73 GHz, consists of a tunable Fabry-Perot resonator followed by superhetrodyne detection for high sensitivity at low power levels. The resonator tuning is accomplished by means of a computer controlled stepping motor and by a piezoelectric transducer which also permits the use of source modulation and phase sensitive detection at 100 Hz. The sensitivity of the spectrometer is adequate to permit the detection of rotational transitions with absorption coefficients as small as 2 x 10/sup -9/ cm/sup -1/. The operation of the spectrometer is demonstrated by the detection of the two free radical species OH and SO. In the case of OH, a number of ..lambda..-doubling transitions, previously unobserved, are reported.

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Dep. NTIS, PC A03/MF A01.

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  • Report No.: LBL-7293
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/5547057 | External Link
  • Office of Scientific & Technical Information Report Number: 5547057
  • Archival Resource Key: ark:/67531/metadc1092925

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • June 1, 1979

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • April 24, 2018, 4:47 p.m.

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Kolbe, W.F.; Zoellner, W.D. & Leskovar, B. Microwave spectrometer for the detection of transient gaseous species, report, June 1, 1979; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc1092925/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.