Thermal and optical excitation of trapped electrons in high-density polyethylene (HDPE) studied through positron annihilation

Positronium as a probe of small free volumes in crystals, polymers and porous media

“…In C17 the photon energy of 1.3 eV was sufficient to empty the traps, while in n-hexane C6 Shantarovich et al [188] have found that the visible light does not remove all trapped electrons. The dependence of the I 3 intensity in high density polyethylene HDPE on the wavelength of illumination was investigated by Nahid et al [189] using optical high pass filters. Pietrow and Wawryszczuk [190] observed that at illumination of n-heptane C7 by LEDs of various wavelengths.…”