Millimeter/submillimeter spectrometer for high resolution studies of transient molecules

Lucy M Ziurys, W. L. Barclay, M. A. Anderson, D. A. Fletcher, J. W. Lamb

Research output: Contribution to journalArticle

108 Citations (Scopus)

Abstract

A millimeter/sub-mm spectrometer was used to study metal bearing free radicals. Gun oscillators were utilized as the tunable source of radiation from 65-140 6Hz. Higher source frequencies were provided by Schottky diode multipliers. Gaussian beam optics were utilized in the design of gas and cell optics. Scalar feedhoms and PTFe lenses propagated the source signal. The gas cell was a cylindrical tube .5 m is length with detachable even. The spectrometer operated in the frequency range of 65-550 GHz. The instrumental resolution was 200-1000 kHz. It had an absorption sensitivity of a few ppm. Pure rotational spectra of metal hydroxide, fluoride and metal hydride were measured. Measurement was also done on multiple rotational transitions. The frequencies of 23 rotational transitions of BaOH were measured over the range of 77-376 GHz. 19 transitions of SrOH were observed in the region 89-370 GHz. Linewidths observed for radicals and closed shell spaces ranged from 200-900 kHz. Fine and hyperfine structures were also resolved. Rare isotopomers were also detected. They included BaOH with the 137Ba and 136Ba nuclei. These results demonstrated the versatility and sensitivity of the instrument.

Original languageEnglish (US)
Pages (from-to)1517-1522
Number of pages6
JournalReview of Scientific Instruments
Volume65
Issue number5
DOIs
StatePublished - May 1994
Externally publishedYes

Fingerprint

Spectrometers
spectrometers
Molecules
hydrides
Optics
high resolution
Bearings (structural)
Metals
optics
molecules
metal hydrides
Gaussian beams
sensitivity
multipliers
rotational spectra
versatility
Schottky diodes
cells
Free radicals
hyperfine structure

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Instrumentation

Cite this

Millimeter/submillimeter spectrometer for high resolution studies of transient molecules. / Ziurys, Lucy M; Barclay, W. L.; Anderson, M. A.; Fletcher, D. A.; Lamb, J. W.

In: Review of Scientific Instruments, Vol. 65, No. 5, 05.1994, p. 1517-1522.

Research output: Contribution to journalArticle

Ziurys, Lucy M ; Barclay, W. L. ; Anderson, M. A. ; Fletcher, D. A. ; Lamb, J. W. / Millimeter/submillimeter spectrometer for high resolution studies of transient molecules. In: Review of Scientific Instruments. 1994 ; Vol. 65, No. 5. pp. 1517-1522.
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