Energy transfer in the radiolysis of solid hydrocarbons at 77 k: Mono-olefins

Abstract

When 1-pentene (or 1-hexene)-toluene mixture is irradiated by γ-rays or ns pulse X-rays, fluorescence from excited toluene is observed. Yields of excited singlet toluene in the olefin-toluene mixtures at 77 K increase remarkably with increasing toluene concentration, while G(H 2) decreases complementarily. The rapid energy transfer from mono-olefin takes place in the solid phase at 77 K. The migration distances of the energy transfer in the radiolysis of solid hydrocarbons, such as aromatics, alkane, and alkene, are proportional to the lifetimes of excited singlet state of the hydrocarbons. The energy transfer is discussed in terms of two models; an exciton transfer and a vibrational relaxation resonance transfer. The exciton transfer offers a better explanation for the energy transfer mechanism in the radiolysis of solid hydrocarbons.