Adam Walters

TL;DR: In this paper, the rotational spectrum of n -butyl cyanide between 75 GHz and 348 GHz was investigated and the authors provided accurate rest frequency predictions beyond the millimeter wave range to search for this molecule in the Galactic center source Sagittarius B2(N).

TL;DR: In this paper, the spectra of deuterated isotopologues of glycolaldehyde in the laboratory were measured for the ALMA range up to 850 GHz with an accuracy for isolated lines better than 30 kHz.

TL;DR: In this paper, the submillimeter-wave spectrum of the CS + radical cation in its ground electronic state (X 2 � + ) has been observed for the first time,inflowing positive column dischargein aCS2-Ar mixturepartiallycooledwithalimited flow of liquid nitrogen.

Abstract: Symmetric molecules have no permanent dipole moment and are undetectable by rotational spectroscopy. Their interstellar observations have previously been limited to mid-infrared vibration-rotation spectroscopy. Although relatively weak, vibrational difference bands provide a means for detection of non polar molecules by terahertz techniques with microwave precision. Herschel, SOFIA, and ALMA have the potential to identify a number of difference bands of light symmetric species, e.g., C H , CH and C . This paper reports the results of the laboratory study on C H and C D . The symmetric isotopomers of acetylene have two bending modes, the trans bending ( ), and the cis bending ( ). For C H , the two bending modes occur at 612 and 729 cm , respectively. For C D , the two bending modes occur at 511 and 538 cm . The difference bands are allowed and occur in the microwave, terahertz, and far-infrared wavelengths, with band origins at 117 cm (3500 GHz) for C H and 27 cm (900 GHz) for C D .