A Microwave Fourier Transform Spectrometer in the Range from 18 to 26.4 GHz Increased Sensitivity Using Circular Waveguides. Measurements of Isotopomeres of Carbonylsulfide and of Methane

Meyer, V.; Jäger, Wolfgang; Schwarz, R.; Dreizler, H.

doi:10.1515/zna-1991-0511

Cited by 25 publications

(8 citation statements)

References 8 publications

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“…Their general design is described elsewhere (23) and in references cited therein. Standard setups containing waveguide cells with rectangular or quadratic cross sections and lengths from 2 to 12 m have been used in the (26,27), have been employed. All measurements were performed at room temperature and sample pressures of about 0.1-0.7 Pa (1-5 mTorr).…”

Section: Resultsmentioning

confidence: 99%

The Ground State Rotational Spectra of HDCO and D2CO

Bocquet

Demaison

Cosléou

et al. 1999

Journal of Molecular Spectroscopy

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Section: Resultsmentioning

confidence: 99%

The Ground State Rotational Spectra of HDCO and D2CO

Bocquet

Demaison

Cosléou

et al. 1999

Journal of Molecular Spectroscopy

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“…A bridge-type construction also allows the use of oversized rectangular waveguides (Wolf and Mäder 1988). Using circular waveguides, even longer cells (>20 m, typically) can be employed by exploiting the very low loss circular TE 01 mode (Meyer et al 1991). An MW pin-diode switch (11c) protects the detection system from the highpower MW pulses.…”

Section: Stationary Gas Short-stimulus Signalmentioning

confidence: 99%

Fourier Transform Microwave Spectroscopy Measurement and Instrumentation

Grabow

2011

Handbook of High‐resolution Spectroscopy

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Microwavemolecular spectroscopy is progressing impressively. In part, profiting from recent experimental developments that combine jet‐expansion sources with elaborate means for preparation of new chemical systems, advances in spectroscopic instrumentation — namely, the rise of very sensitive and high‐resolution time‐domain techniques — are even more significant. Precise structural studies have always been a strength of rotational spectroscopy; now problems arising from convoluted intramolecular dynamics, such as conformational, tautomeric equilibria, and other large amplitude motions, as well as intermolecular vibrational energy redistribution and isomerization, can be targeted with the unrivaled precision of rotational investigations. Numerous interesting chemical systems like molecules with multiple concurrent internal motions, larger complexes, aggregates, biomolecules, and transient species were characterized recently — positioning microwave spectroscopy today as a prime method for the investigation of multidimensional flexible systems. Rotational studies elucidate an extensive range of intermolecular interactions, ranging from hydrogen bonding and van der Waals interaction to the unusual effects observed in quantum solvation. The development of microwave pulsed excitation multiresonance techniques and the advent of instantaneous broadband‐coverage microwave spectroscopy are impressively boosting the capabilities of rotational spectroscopy to quite routinely disentangle the unique spectral signatures that encode the structure and dynamics of hitherto pathological molecular cases. The versatile capabilities of microwave coherence spectroscopy are outlined in the treatment of time‐dependent interaction of rotating molecules with radiation.

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“…Further details on the spectrometer are given by Krüger et al (1993) and Meyer et al (1991). Xu & Lovas (1997); see also the discussion.…”

Section: Cologne and Kiel Laboratory Measurementsmentioning

confidence: 99%

Accurate rest frequencies of methanol maser and dark cloud lines

Müller¹,

Menten

Mäder

2004

A&A

105

100

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Abstract.We report accurate laboratory measurements of selected methanol transition frequencies between 0.834 and 230 GHz in order to facilitate astronomical velocity analyses. New data have been obtained between 10 and 27 GHz and between 60 and 119 GHz. Emphasis has been put on known or potential interstellar maser lines as well as on transitions suitable for the investigation of cold dark clouds. Because of the narrow line widths (<0.5 km s −1 ) of maser lines and lines detected in dark molecular clouds, accurate frequencies are needed for comparison of the velocities of different methanol lines with each other as well as with lines from other species. In particular, frequencies for a comprehensive set of transitions are given which, because of their low energy levels (<20 cm −1 or 30 K), are potentially detectable in cold clouds. Global Hamiltonian fits generally do not yet yield the required accuracy. Additionally, we report transition frequencies for other lines that may be used to test and to improve existing Hamiltonian models.

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A Microwave Fourier Transform Spectrometer in the Range from 18 to 26.4 GHz Increased Sensitivity Using Circular Waveguides. Measurements of Isotopomeres of Carbonylsulfide and of Methane

Cited by 25 publications

References 8 publications

The Ground State Rotational Spectra of HDCO and D2CO

The Ground State Rotational Spectra of HDCO and D2CO

Fourier Transform Microwave Spectroscopy Measurement and Instrumentation

Accurate rest frequencies of methanol maser and dark cloud lines

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