Vibronic spectra, ab initio calculations, and structures of conformationally non-rigid molecules of oxalyl halides in the ground and lowest excited electronic states. Part IV: Analysis of the absorption spectra of oxalyl fluoride in the gas phase

In the low resolution ultraviolet absorption spectrum of oxalyl fluoride in the gas phase the A˜1B1←X˜1A1 transition of the cis-conformer (νmax) was found to be shifted to the blue by about 6000 cm−1 relative to the A˜1Au←X˜1Ag transition of the trans-conformer.