  A model has been proposed for estimation of plasma parameters of explosive
electron emission pulses in vacuum arc discharge. It based on transition
through the critical state during the explosion and allow to predict the
cathode spot plasma parameters for various materials. The cathode flare plasma
ions kinetic energy was estimated to be of about 100 times critical
temperature. Average ions charge has been estimated as (1 + critical
temperature value in eV). Both dependencies agree with experimental results.
Explosive electron emission plasma momentum per transferred charge has been
evaluated to be about tens of g cm / (s C) and agrees with the product of
measured ions velocity and erosion rate. Effective critical temperature
approach has been proposed for the estimation of plasma properties for the arc
burning at surface with a fine structure
