Photodissociation of heptane isomers and relative ionization efficiencies of butyl and propyl radicals at 157 nm.

摘要: We report an ion imaging and time-of-flight mass spectroscopy study of the photodissociation a variety heptane isomers using 157 nm dissociation ionization. Time-of-flight spectra show that C3H7 + C4H9 is dominant detected product channel following one-color dissociation/ionization heptanes. The results further allow determination relative ionization efficiencies 1- 2-butyl propyl radicals at nm. Momentum matching for two radical products indicates that, C3–C4 products, neutral followed by main source signals. images isotropic angular distributions translational energy peak very low energy, with only ∼0.3 eV or 8% available appearing in translation. This consistent from ground state low-lying triplet states non-radiative electronic relaxation.