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Rotational spectrum of three conformers of 3,3-difluoropentane: Construction of a 480 MHz bandwidth chirped-pulse Fourier-transform microwave spectrometer |
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| Authors: | Daniel A Obenchain Amanda L Steber Sean A Peebles Charles J Wurrey |
| Institution: | a Department of Chemistry, Eastern Illinois University, 600 Lincoln Avenue, Charleston, IL 61920, USA b Department of Chemistry, University of Missouri-Kansas City, Kansas City, MO 64110, USA c Department of Chemistry and Biochemistry, The College of Charleston, 66 George Street, Charleston, SC 29424, USA |
| Abstract: | The rotational spectra for three conformers of 3,3-difluoropentane have been measured using both a newly constructed narrow bandwidth chirped-pulse Fourier-transform microwave spectrometer and a Balle-Flygare resonant cavity Fourier-transform microwave spectrometer. The chirped-pulse instrument produces a microwave pulse spanning up to 480 MHz bandwidth in the 7-18 GHz region by mixing a 1 μs chirped pulse (of up to 240 MHz bandwidth) from an arbitrary function generator with the output from a microwave synthesizer.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. |
| Keywords: | Difluoropentane Broadband Fourier-transform microwave Conformer |
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