Extending the laboratory rotational spectrum of linear C3H+

Abstract

The rotational spectrum of linear C${}_3$H${}^{+}$ has been revisited in the millimeter-wave region using a cryogenic ion trap apparatus employing a double-resonance scheme based on leak-out action spectroscopy (LOS). Eight rotational transitions ($J^{\prime }\leftarrow J^{\prime \prime }=4\leftarrow 3$ up to $J^{\prime }\leftarrow J^{\prime \prime }=11\leftarrow 10$) have been measured in the 85-250$$GHz frequency range. With the laboratory measurements reported here, improved values for the ground-state spectroscopic constants of C${}_3$H${}^{+}$ have been obtained.