Submillimeter absorption from SH+, a new widespread interstellar radical, 13CH+ and HCl

@article{Menten2011SubmillimeterAF,
  title={Submillimeter absorption from SH+, a new widespread interstellar radical, 13CH+ and HCl},
  author={Karl M. Menten and Friedrich Wyrowski and Arnaud Belloche and Rolf Guesten and Leonidas Dedes and Holger S. P. Mueller},
  journal={Astronomy and Astrophysics},
  year={2011},
  volume={525}
}
We have used the Atacama Pathfinder Experiment 12 m telescope (APEX) to carry out an absorption study of submillimeter wavelength rotational ground-state lines of H 35 Cl, H 37 Cl, 13 CH + , and, for the first time, of the SH + radical (sulfoniumylidene or sulfanylium). We detected the quartet of ground-state hyperfine structure lines of SH + near 683 GHz with the CHAMP+ array receiver against the strong continuum source Sagittarius B2, which is located close to the center of our Galaxy. In… 

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Two emission lines, each ~15 MHz above the SH(+) predictions and with relative intensities and HFS splitting expected for SH(+), are detected, which will be useful for future observations of SH( +), in particular if its lowest frequency FS components are studied.

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ArH+ is isoelectronic with HCl. The J = 1-0 and 2-1 transitions of 36ArH+ near 617.5 and 1234.6 GHz, respectively, have been identified very recently as emission lines in spectra obtained with

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The rotational spectrum of H2NCO+, the ground-state isomer of protonated HNCO, has been measured in a molecular beam in the centimeter band with a Fourier transform microwave spectrometer and in a
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