Fischer, GadWormell, Paul2015-12-130301-0104http://hdl.handle.net/1885/89947The first singlet-singlet and singlet-triplet band systems of the absorption spectrum of pyridazine vapour are analysed using ab initio and vibronic coupling calculations. The lowest singlet-triplet absorption involves a comparatively unperturbed (π(*),nKeywords: pyridazine derivative; absorption spectroscopy; article; chemical structure; energy; geometry; model; vapor; vibrationVibronic analyses of the lowest singlet-singlet and singlet-triplet band systems of pyridazine200010.1016/S0301-0104(00)00137-32015-12-12