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We have measured the energy dependence of the liquid xenon (LXe)scintillation yield of electrons with energy between 2.1 and 120.2keV, usingthe Compton coincidence technique. A LXe scintillation detector with a veryhigh light detection efficiency was irradiated with 137Cs {\gamma} rays and theenergy of the Compton-scattered {\gamma} rays was measured with a high-puritygermanium (HPGe) detector placed at different scattering angles. The excellentenergy resolution of the HPGe detector allows the selection of events withCompton electrons of known energy in the LXe detector. We find that thescintillation yield initially increases as the electron energy decreases from120 keV to about 60keV but then decreases by about 30% from 60keV to 2keV. Themeasured scintillation yield was also measured with conversion electrons fromthe 32.1 keV and 9.4 keV transitions of the 83mKr isomer, used as an internalcalibration source. We find that the scintillation yield of the 32.1 keVtransition is compatible with that obtained from the Compton coincidencemeasurement. On the other hand, the yield for the 9.4keV transition is muchhigher than that measured for a Compton electron of the same energy. Weinterpret the enhancement in the scintillation yield as due to the enhancedrecombination rate in the presence of Xe ions left from the 32.1 keVtransition, which precedes the 9.4 keV one by 220 ns, on average.

Measurement of the Scintillation Yield of Low-Energy Electrons in Liquid Xenon