Search

The effect of bromine (Br 2) doping on the hole transfer properties in amorphous polyethylene (PE) oligomer is studied by utilizing a multi-scale computational approach without adopting any empirical models. The computational method comprises molecular dynamics simulations, quantum chemical calculations, and kinetic Monte Carlo simulations. The electronic structure of the Br 2 /PE oligomer cluster and the ionization energies of Br 2 and PE oligomer showed that no impurity states are introduced in the HOMO-LUMO gap of PE oligomers upon Br 2 doping, i.e., holes tend to hop between PE oligomers instead of residing in Br 2. Nevertheless, owing to the increase of electronic couplings between PE oligomers due to the occupied states of Br 2 , the hole mobility is increased by an order of magnitude with Br 2 doping. In addition, the hole mobility activation energy was decreased upon Br 2 doping, even though the activation energies of hole hopping rates remain the same. The computational results are consistent with experimental observations in literature and imply that the hole mobility in PE is increased by the bridge mediated hole transfer. [ABSTRACT FROM AUTHOR]

A noncontact measurement of electric field is proposed on the basis of Kerr effect in gases. It is a measurement system using optical phase modulation.

Presents a study which investigated the nanosecond time-scale developing mechanisms of positive and negative corona streamers on the insulation surface. Measurement of the developing length of the corona streamers; Ratio of developing length obtained at a certain pressure and those obtained in the time range of 5-920 nanosecond; Conclusions.

Studies nanosecond surface discharge by using a simulation model. Experimental results at atmospheric pressure; Simulation models for nanosecond surface discharge development; Method of calculation.