Improved vibrational ground-state spectroscopic parameters of CH2FI and assignment the rotational spectrum of the v6=1 vibrational state

The rotational spectrum of fluoroiodomethane, CH2FI, has been recorded in the 1.02\u20131.05 THz frequency range, allowing us to extend the set of known spectroscopic parameters with respect to our previous work. In particular, three additional octic centrifugal-distortion constants and the K-dependence for all quadrupole-coupling constants have been determined. Furthermore, the rotational spectrum of the v6 = 1 vibrational state has been recorded and assigned in the 171\u2013184 and 534\u2013536 GHz frequency ranges, spanning the quantum number J from 4 to 79. This allowed us to provide for the first time accurate rotational, quartic, sextic, and three octic centrifugal-distortion constants and the iodine hyperfine parameters