Rotational spectrum of three conformers of 3,3-difluoropentane: Construction of a 480Â MHz bandwidth chirped-pulse Fourier-transform microwave spectrometer

Rotational spectra for the normal isotopic species and all possible 13C single substitutions were observed for the gauche-gauche and anti-gauche conformers, allowing a Kraitchman substitution structure and an inertial fit structure to be determined. 13C isotopic species and dipole moment components were not measurable for the less intense anti-anti species as a result of partially resolved fine splitting. Details of the new chirped-pulse instrument will be described and the structural results will be presented and compared with ab initio data for 3,3-difluoropentane.