The light yield, or electroluminescence yield, of pure xenon for reduced electric fields below the ionization threshold (about 6 Vcm-1torr-1) was measured for pressures of 825, 570 and 276 torr using a uniform field gas proportional scintillation counter excited with 5.9 keV x rays. A linear behavior was exhibited from the 1 Vcm-1torr-1 electroluminescence threshold, but the measured yield (for lambda greater than 165 nm) diminished with the gas pressure. The best energy resolution obtained was 7.6% for collimated 5.9 keV x rays with xenon at 825 torr. A Fano factor of 0.26 was measured for the three xenon pressures.
Experimental measurements were made for the w-value for 5.9 keV x rays in pure argon, argon with 4% xenon, argon with 21% xenon, and pure xenon at pressures just above the atmospheric. The values obtained are 26.2 eV +/- 0.7 eV, 22.0 eV +/- 0.9 eV, 21.4 +/- 0.9 eV, and 21.7 eV +/- 0.5 eV, respectively. The importance of the 96% argon - 4% xenon mixture in gas proportional scintillation counters for the detection of soft x rays with reduced spectral distortion is discussed.
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