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

astrophysical journal/the astrophysical journal

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