First laboratory detection of vibration-rotation transitions of CH$^+$ and $^{13}$CH$^+$ and improved measurement of their rotational transition frequencies
arXiv:1802.10032 · doi:10.3847/1538-4357/aab36a
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.
Accepted for publication in the Astrophysical Journal on Feb 26, 2018. Two figures and five tables