Accurate laboratory rest frequencies of vibrationally excited CO up tov= 3 and up to 2 THz
| Autor: | Holger S. P. Müller, Frank Lewen, G. Klapper, J. A. Coxon, R. Gendriesch, Karl M. Menten, Gisbert Winnewisser |
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| Rok vydání: | 2009 |
| Předmět: |
Chemical Physics (physics.chem-ph)
Physics Cosmology and Nongalactic Astrophysics (astro-ph.CO) Terahertz radiation FOS: Physical sciences Astronomy and Astrophysics Astrophysics Astrophysics - Astrophysics of Galaxies Wavelength Space and Planetary Science Physics - Chemical Physics Astrophysics of Galaxies (astro-ph.GA) Excited state Distortion Quartic function Millimeter Emission spectrum Rotational spectroscopy Atomic physics Astrophysics - Instrumentation and Methods for Astrophysics Instrumentation and Methods for Astrophysics (astro-ph.IM) Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Astronomy & Astrophysics. 497:927-930 |
| ISSN: | 1432-0746 0004-6361 |
| Popis: | Astronomical observations of (sub)millimeter wavelength pure rotational emission lines of the second most abundant molecule in the Universe, CO, hold the promise of probing regions of high temperature and density in the innermost parts of circumstellar envelopes. The rotational spectrum of vibrationally excited CO up to $\varv = 3$ has been measured in the laboratory between 220 and 1940 GHz with relative accuracies up to $5.2 \times 10^{-9}$, corresponding to $\sim 5$ kHz near 1 THz. The rotational constant $B$ and the quartic distortion parameter $D$ have been determined with high accuracy and even the sextic distortion term $H$ was determined quite well for $\varv = 1$ while reasonable estimates of $H$ were obtained for $\varv = 2$ and 3. The present data set allows for the prediction of accurate rest frequencies of vibrationally excited CO well beyond 2 THz. Comment: Astron. Astrophys, accepted; 5 pages, 2 Figures, 2 Tables |
| Databáze: | OpenAIRE |
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