Abstract
We have measured the absolute quantum efficiency (QE) of fluorescence from the Na-Hg vapor excited by Hg (253.7 nm) resonance radiation. The measurements were carried out as a function of Na mole fraction (XNa) in the Na-Hg solid amalgam (XNa = 0–100%) and temperature (T = 200– 550 °C). Highest efficiency obtained was 115±15% for XNa = 0.76 and T = 325–375 °C. We believe these to be the first quantum efficiency measurements in gas phase systems where QE≳100% is observed.
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