material Ar real
 heat_capacity constant
  capacity 1.0
 end
 electron_heat_capacity constant, no density
  capacity 1.0
 end
 effective_mass constant
  inv_effective_mass 1.
 end
 heat_flux linear
  conductivity 1.0
 end
 electron_heat_flux linear
  conductivity 1.0
 end
 electron_phonon_exchange linear
  coefficient 1.0
 end
 electron_flux linear
  mobility               400.0
  diffusivity            1000.0
 end
 electron_recombination linear
  inv_relaxation_time    0.0
  equilibrium_carrier_density 1.0
 end
 electric_field linear
  permittivity 0.2
 end
end

material Vacuum real
 electric_field linear
  permittivity 1.0
 end
end