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We study the time-dependent conductance of electron-glasses excited byelectromagnetic radiation at microwaves (MW) and infra-red frequencies. Ineither case the conductance G is enhanced during exposure but its timedependence after the radiation is turned off is qualitatively differentdepending on the frequency. For comparison, results of excitation produced by agate-voltage and temperature changes are also shown. The glassy nature of thesystem allows us to demonstrate that the MW-enhanced conductance is not due toheating. These findings are discussed in terms of an energy E_{c} thatcharacterizes the equilibrium charge distribution of the electron-glass.

Conductance relaxation in the Electron-Glass; Microwaves versus infra-red response