Abstract
Photoionization effects have been observed in liquid xenon doped with triethylamine (TEA) or trimethylamine (TMA) by using a small multiwire chamber whose anode consists of 9 wires of 10 μm in diameter. Quantum efficiencies for photoionization in both dopants are estimated to be close to unity for photons emitted from liquid xenon. Electron multiplication related to proportional scintillation was observed at wire voltages above about 3 kV. The energy resolution in ionization mode for alpha particles is improved from 15% to 4% (fwhm) by introducing TEA.
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