Absorption Measurements of Ar–COb-Type Rotational Transitions with a Supersonic Jet Millimeter-Wave Spectrometer
✍ Scribed by M. Hepp; W. Jäger; I. Pak; G. Winnewisser
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 149 KB
- Volume
- 176
- Category
- Article
- ISSN
- 0022-2852
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✦ Synopsis
Pure rotational b-type transitions of Ar-CO were observed in the frequency range from 70 to 103 GHz using a combination of millimeter-wave absorption spectroscopy with supersonic jet expansion. The millimeter-wave radiation was generated by precision tunable synthesizers equipped with backward wave oscillators. Altogether 14 transitions belonging to Q and R branches with K a Å 1 0 0 have been measured with an accuracy of about 50 kHz. Our results confirm the microwave-millimeter-wave double resonance experiments of Ja ¨ger and Gerry [J. Chem. Phys. 102, 3587-3592 (1995)] and demonstrate the sensitivity of the direct absorption technique for the detection of van der Waals clusters with a small dipole moment.