H. Okada et al., TIME STABILITY OF LIQUID XENON PHOTOIONIZATION DETECTORS, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 374(2), 1996, pp. 188-192
We measured the collected charges, the energy resolution and their tim
e: stability using an ionization chamber filled with liquid xenon dope
d with trimethylamine (TMA) as photoionization molecules. When liquid
xenon was doped with a low concentration of TMA purified al -110 degre
es C, the chamber was operated stably at -110 degrees C for about 50 h
.