Neutral bremsstrahlung electroluminescence in noble liquids

Abstract Proportional electroluminescence (EL) is the physical effect used in two-phase dark matter detectors, to optically record gas phase ionization signal produced by particle scattering liquid phase. In our previous works presence of a new EL mechanism noble gases, namely that neutral bremsstrahlung (NBrS), was demonstrated both theoretically and experimentally, addition ordinary due excimer emission. this work we show similar theoretical approach can apply liquids, helium, neon, argon, krypton xenon. particular, photon yields spectra for NBrS liquids have been calculated first time, using electron energy transport parameters obtained framework Cohen-Lekner Atrazhev theory. The relevance results development detectors searches neutrino experiments discussed.