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

Volume

3

Issue

2

fYear

1996

fDate

4/1/1996 12:00:00 AM

Firstpage

233

Lastpage

236

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;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/94.486775

Filename

486775