| Attributs | Valeurs |
|---|
| type
| |
| Is Part Of
| |
| Subject
| |
| Title
| - Extension of the millimeter- and submillimeter-wave spectral databases of deuterated methyl cyanides (CH 2DCN and CHD 2CN)
|
| Date
| |
| has manifestation of work
| |
| related by
| |
| Author
| |
| Abstract
| - Context. The study of deuterated abundant molecules is recognized as important in understanding molecular complexity in star -forming regions. Aims. We seek to assign the laboratory millimeter and submillimeter wave rotational spectra of the CHD 2CN and CH 2DCN deuterated isotopologues of methyl cyanide over a wide frequency range in order to provide precise spectral predictions for observations. Methods. Using the solid-state submillimeter-wave spectrometer in Lille, we measured and assigned 723 new lines for CHD 2CN and 307 new lines for CH 2DCN. The observed rotational transition frequencies were fitted with the ASFIT program to determine the spectroscopic parameters. The prediction of transition frequencies was performed using the SPCAT program. Results. Measurements for both isotoplogues were taken up to 945 GHz and are made available at the CDS. For CHD 2CN this is significantly higher than the previous range of measurement up to 40 GHz. For CH 2DCN many more lines of high Ka have been measured than previously. Conclusions. Our work confirms the recent analysis for CHD 2CN given in the CDMS database and extends the number of determined molecular parameters from 10 to 19. For CH 2DCN, 3 new parameters including DK have been determined, and the uncertainty on parameters has been decreased by a factor of approximately 2. For both isotopologues the measured data show shifts in the frequency of some high Ka transitions that are attributed to interactions with a low-lying vibrational state. The availability of more directly measured data and the increase in confidence of the predictions to higher quantum numbers and frequencies will be helpful for the radio astronomical detection of deuterated isotopologues of methyl cyanide in the interstellar medium.
|
| article type
| |
| publisher identifier
| |
| Date Copyrighted
| |
| Rights
| |
| Rights Holder
| |
| is part of this journal
| |
| is primary topic
of | |
