First laboratory detection of vibration-rotation transitions of CH${}^{+}$ and ${}^{13}$CH${}^{+}$ and improved measurement of their rotational transition frequencies

Abstract

The long-searched C-H stretches of the fundamental ions CH${}^{+}$ and ${}^{13}$CH${}^{+}$ have been observed for the first time in the laboratory. For this, the state-dependent attachment of He atoms to these ions at cryogenic temperatures has been exploited to obtain high-resolution rovibrational data. In addition, the lowest rotational transitions of CH${}^{+}$, ${}^{13}$CH${}^{+}$ and CD${}^{+}$ have been revisited and their rest frequency values improved substantially.

arXiv commentAccepted for publication in the Astrophysical Journal on Feb 26, 2018. Two figures and five tables

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• Descendant of the X-ogen carrier and a "mass of 69": Infrared action spectroscopic detection of HC${}_3$O${}^{+}$ and HC${}_3$S${}^{+}$
• Spectroscopy and ion thermometry of C${}_2^{-}$ using laser-cooling transitions
• Observations and analysis of CH${}^{+}$ vibrational emissions from the young, carbon-rich planetary nebula NGC 7027: a textbook example of chemical pumping
• Accurate rotational rest frequencies for ammonium ion isotopologues
• High-resolution infrared action spectroscopy of the fundamental vibrational band of CN+
• Rovibrational spectroscopy of the CH${}^{+}$-He and CH${}^{+}$-He${}_4$ complexes
• PDRs4All XV: CH radical and H${}_3^{+}$ molecular ion in the irradiated protoplanetary disk d203-506
• Laser-probing the rotational cooling of molecular ions by electron collisions