Figure 3

Calculated ionization fraction as a function of time for a low-density Cu foil in a constant applied electric field. The applied field strength ranges from 5 × 1012 to 5.5 × 1013 V/m.
Calculated ionization fraction as a function of time for a low-density Cu foil in a constant applied electric field. The applied field strength ranges from 5 × 1012 to 5.5 × 1013 V/m.