Updated model for dielectric response function of liquid water

A modified and updated version of the model of the dielectric response function of liquid water as currently implemented in the PARTRAC code is presented. The updated version takes advantage of the newer experimental information from the Sendai group and implements some improvements in modeling and usability.

► Updated model of the dielectric response function and energy loss function of liquid water is presented.
► The new model includes new available experimental information (Sendai data).
► It is an analytical model.
► The mean excitation energy is calculated as 78.3 eV.