Experimental study of ionization yield of liquid xenon for electron   recoils in the energy range 2.8 - 80 keV
  We present the results of the first experimental study of ionization yield of electron recoils with energies below 100 keV produced in liquid xenon by the isotopes: 37Ar, 83mKr, 241Am, 129Xe, 131Xe. It is confirmed by a direct measurement with 37Ar isotope (2.82 keV) that the ionization yield is growing up with the energy decrease in the energy range below ~ 10 keV accordingly to the NEST predictions. Decay time of scintillation at 2.82 keV is measured to be 25 +/- 3 ns at the electric field of 3.75 kV/cm. 
D.Yu. Akimov, V.V. Afanasyev, I.S. Alexandrov, V.A. Belov, A.I.   Bolozdynya, A.A. Burenkov, Yu.V. Efremenko, D.A. Egorov, A...
physics.ins-det hep-ex