Electronic state spectroscopy of 1,4-pentadiene as studied by VUV photoabsorption spectroscopy and ab initio calculations

摘要

We present high resolution VUV photoabsorption spectra of 1,4-pentadiene, C _5H _8, over the wavelength range 115-247 nm (10.8-5.0 eV). These spectra reveal several new features not previously reported in the literature. These measurements are complemented by the first ab initio calculations for the three most abundant conformational isomers of 1,4-pentadiene, C _5H _8, which we then use in the assignment of valence and Rydberg transitions. Calculations of the two lowest energy ionic states of 1,4-pentadiene are also presented and compared with the experimental data available in the literature. The measured absolute photoabsorption cross sections have been used to calculate the photolysis lifetime of 1,4-pentadiene in the upper stratosphere (20-50 km).