Extension of the millimeter- and submillimeter-wave spectral databases of deuterated methyl cyanides (CH2DCN and CHD2CN)

摘要: Context. The study of deuterated abundant molecules is recognized as important in understanding molecular complexity starforming regions. Aims. We seek to assign the laboratory millimeter and submillimeter wave rotational spectra CHD2CN CH2DCN isotopologues methyl cyanide over a wide frequency range order provide precise spectral predictions for observations. Methods. Using solid-state submillimeter-wave spectrometer Lille, we measured assigned 723 new lines 307 CH2DCN. observed transition frequencies were fitted with ASFIT program determine spectroscopic parameters. prediction was performed using SPCAT program. Results. Measurements both isotoplogues taken up 945 GHz are made available at CDS. For this significantly higher than previous measurement 40 GHz. many more high Ka have been previously. Conclusions. Our work confirms recent analysis given CDMS database extends number determined parameters from 10 19. CH2DCN, 3 including DK determined, uncertainty on has decreased by factor approximately 2. data show shifts some transitions that attributed interactions low-lying vibrational state. availability directly increase confidence quantum numbers will be helpful radio astronomical detection interstellar medium.