A note on dissociative photoionization of neopentane in the 10–30 e V photon energy range Original Research Article

The photofragmentation of neopentane in the photon energy range 10–30 eV with synchrotron radiation is analysed and compared with previous data on mass and photoelectron spectra of this molecule. A broad maximum due to a shape resonance in the ion yield of the most abundant fragment ions is observed around 16 eV photon energy along with Rydberg series converging to the 2a1−1 ionization threshold. The analysis of the branching ratios of the main fragment ions hints at a preferential decay of the shape resonance through the ionization channel 3t2−1.