Title :
Light-induced electron emission from polymethylphenyl siloxane oils
Author :
Koizumi, Hitoshi ; Lacmann, Klaus ; Schmidt, Werner F.
Author_Institution :
Fac. of Eng., Hokkaido Univ., Sapporo, Japan
fDate :
4/1/1996 12:00:00 AM
Abstract :
Light-induced electron emission from tetramethyl tetraphenyl trisiloxane, (Dow-Corning silicone oil DC704) and trimethyl pentaphenyl siloxane (Wacker Chemie silicone oil AN175) has been measured as a function of photon energy. Absolute quantum yield and threshold energy were determined. The threshold energy of 7.5 eV for both siloxanes is comparable to the thresholds of other polymethylphenyl siloxanes with phenyl/methyl ratios of 1/3 and 1/18, which have been investigated by the authors. The quantum yield as a function of photon energy shows a systematic change with variation of the phenyl/methyl ratio. This dependence on the molecular structure is ascribed to a change of the initial ionization quantum yield
Keywords :
photoemission; photoionisation; silicone insulation; transformer oil; 7.5 eV; Dow-Corning silicone oil DC704; Wacker Chemie silicone oil AN175; absolute quantum yield; ionization quantum yield; light-induced electron emission; molecular structure; phenyl/methyl ratio; photon energy; polymethylphenyl siloxane oils; tetramethyl tetraphenyl trisiloxane; threshold energy; trimethyl pentaphenyl siloxane; Cathodes; Dielectric liquids; Dielectrics and electrical insulation; Electron emission; Energy measurement; Oils; Petroleum; Photoconductivity; Portable media players; Power transformer insulation;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
