VUV photoionization process in non polar dielectric liquids

The present paper must be considered as an overview on our recent or more a ncient works about photoionization processes in non-polar liquids. The main points examined are : Determination of the conduction level in the liquid phase : Vo. Determination of the ionization threshold and the power laws of the photocu rrent as a function of the excess energy of photons. Determination of photoionization parameters i.e.: photoionization quantum y ield and thermalization distance of photoelectrons. Estimation of the spatial distribution function of photoelectrons, around t heir geminate positive ion. The possible existence of metastable spatially extended excited states (Ryd berg states) above the liquid ionization threshold. Here we examine which of our works are simple pieces of well supported theo ries, which are a contribution to more opened questions.