A free electron can serve as the probe for the local environment when injected into water without Ultrafast spectroscopy probes the coordination environment of a specific site by measuring the electron and phonon lifetimes or abundance dissipation dynamics. The phonon lifetime varies with the vibration frequency , and the electron lifetime is proportional to its inverse bound energy . Both lifetimes depend positively on the extent of local HB polarization, decaying at a slower rate in the supersolid phase.