Details
| Original language | English |
|---|---|
| Pages (from-to) | 4072-4084 |
| Number of pages | 13 |
| Journal | Review of scientific instruments |
| Volume | 67 |
| Issue number | 12 |
| Publication status | Published - Dec 1996 |
Abstract
The design, performance, and operation of a broadband (3-26.5 GHz) high resolution microwave spectrometer is described. In comparison to previously developed molecular beam Fabry-Perot resonator spectrometers the design presented here implements some significant improvements: a coaxially oriented beam resonator arrangement (COBRA) formed by a confocal pair of mirrors incorporating an electromechanical valve and employing two pairs of microwave antennas, and a multioctave Fourier-transform microwave (FTMW) instrument providing the pulsed excitation source with microwave pulse phase-inversion scheme and the low-noise receiving system employing image-rejection downconversion with superheterodyne as well as quadrature detection. The entire apparatus, fully automated for scanning operation, covers a frequency range of more than three octaves. The novel design of the FTMW instrument does not require any changes of the spectrometer hardware in order to reach all regions of its spectral range. While operated in high resolution mode the COBRA-FTMW spectrometer is achieving a linewidth (half-width at half-height, HWHH) relative to the molecular emission frequency of better than 10-7 HWHH. The sensitivity and resolution of the spectrometer is demonstrated by several examples.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Instrumentation
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In: Review of scientific instruments, Vol. 67, No. 12, 12.1996, p. 4072-4084.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - A multioctave coaxially oriented beam-resonator arrangement Fourier-transform microwave spectrometer
AU - Grabow, Jens Uwe
AU - Stahl, Wolfgang
AU - Dreizler, Helmut
PY - 1996/12
Y1 - 1996/12
N2 - The design, performance, and operation of a broadband (3-26.5 GHz) high resolution microwave spectrometer is described. In comparison to previously developed molecular beam Fabry-Perot resonator spectrometers the design presented here implements some significant improvements: a coaxially oriented beam resonator arrangement (COBRA) formed by a confocal pair of mirrors incorporating an electromechanical valve and employing two pairs of microwave antennas, and a multioctave Fourier-transform microwave (FTMW) instrument providing the pulsed excitation source with microwave pulse phase-inversion scheme and the low-noise receiving system employing image-rejection downconversion with superheterodyne as well as quadrature detection. The entire apparatus, fully automated for scanning operation, covers a frequency range of more than three octaves. The novel design of the FTMW instrument does not require any changes of the spectrometer hardware in order to reach all regions of its spectral range. While operated in high resolution mode the COBRA-FTMW spectrometer is achieving a linewidth (half-width at half-height, HWHH) relative to the molecular emission frequency of better than 10-7 HWHH. The sensitivity and resolution of the spectrometer is demonstrated by several examples.
AB - The design, performance, and operation of a broadband (3-26.5 GHz) high resolution microwave spectrometer is described. In comparison to previously developed molecular beam Fabry-Perot resonator spectrometers the design presented here implements some significant improvements: a coaxially oriented beam resonator arrangement (COBRA) formed by a confocal pair of mirrors incorporating an electromechanical valve and employing two pairs of microwave antennas, and a multioctave Fourier-transform microwave (FTMW) instrument providing the pulsed excitation source with microwave pulse phase-inversion scheme and the low-noise receiving system employing image-rejection downconversion with superheterodyne as well as quadrature detection. The entire apparatus, fully automated for scanning operation, covers a frequency range of more than three octaves. The novel design of the FTMW instrument does not require any changes of the spectrometer hardware in order to reach all regions of its spectral range. While operated in high resolution mode the COBRA-FTMW spectrometer is achieving a linewidth (half-width at half-height, HWHH) relative to the molecular emission frequency of better than 10-7 HWHH. The sensitivity and resolution of the spectrometer is demonstrated by several examples.
UR - http://www.scopus.com/inward/record.url?scp=0001598262&partnerID=8YFLogxK
U2 - 10.1063/1.1147553
DO - 10.1063/1.1147553
M3 - Article
AN - SCOPUS:0001598262
VL - 67
SP - 4072
EP - 4084
JO - Review of scientific instruments
JF - Review of scientific instruments
SN - 0034-6748
IS - 12
ER -