Abstract
TMAE (tetrakis-dimethylamino-ethylene) has been widely used in photo-ionization detectors in the last decade. As a gas photocathode, it has one of the lowest ionization potentials of the organic compounds studied to date, a high quantum efficiency, and adequate vapor pressures at just above room temperatures. In order to understand the gas amplification mechanism of an avalanche chamber filled with a TMAE-based gas mixture operated at a low gas pressure, we have measured the first Townsend coefficient for a TMAE-He mixture with a parallel plate avalanche chamber. Based on this result, the gas amplification process in wire chambers operated at low gas pressure is discussed. >
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