High-resolution infrared action spectroscopy of the fundamental vibrational band of CN+

Abstract

Rotational-vibrational transitions of the fundamental vibrational modes of the CN and CN cations have been observed for the first time using a cryogenic ion trap apparatus with an action spectroscopy scheme. The lines P(3) to R(3) of CN and R(1) to R(3) of CN have been measured, limited by the trap temperature of approximately 4 K and the restricted tuning range of the infrared laser. Spectroscopic parameters are presented for both isotopologues, with band origins at 2000.7587(1) and 1970.321(1) cm, respectively, as well as an isotope independent fit combining the new and the literature data.