Scintillation yield of liquid xenon at room temperature

The intensity of scintillation light emission from liquid xenon at room temperature was measured. The scintillation light yield at 1∘C was measured to be 0.64±0.020.64±0.02 (stat.) ±0.06±0.06 (sys.) of that at -100∘C. Using the reported light yield at -100∘C (46 photons/keV), the measured light yield at 1∘C corresponds to 29 photons/keV. This result shows that liquid xenon scintillator provides high light yield even at room temperature.