Rotational spectroscopy of 2-methylfuran from 8.7 to 960 GHz

Abstract

The rotational spectrum of 2-methylfuran has been measured from 8.7 to 960GHz using a chirped-pulse waveguide spectrometer to collect the centimeter-wave data and a direct absorption flow cell spectrometer to collect the millimeter- and submillimeter-wave data. Over 19,000 transitions in the vibrational ground state spectrum and over 6000 transitions in the spectrum of the first excited state of the methyl torsion were assigned. Fits were performed with both XIAM and ERHAM. Both programs successfully predicted the position and relative intensity of forbidden c-type transitions, but the fits from ERHAM had substantially lower RMS values than those from XIAM for roughly equivalent numbers of adjustable parameters.