Abstract
We consider the process of cold emission of electrons from a metal in a strong low-frequency laser field. An expression is obtained for the electron spectrum with allowance for their rescattering at the metal surface as a result of an extension of the Fowler-Nordheim theory and modification of the Simplemen model. The numerically simulated features of the electron spectrum are similar to the ATI spectra for atoms and have the same form as the experimental surface emission dependencies for a metal.
Highlights
Hereinafter, we use the atomic system of units where e m 1
Thermal emission does not lead to a significant change in the emission current density, and there are no temperature factors in equation (1)
The current of cold electron emission in vacuum in a low-frequency laser field is caused by the tunneling of electrons from the metal through the barrier defined by equation (3)
Summary
Where U p is the ponderomotive potential, and the maximum energy of the electron does not exceed 2U p. Passing from the distribution of the probability of emission in time to the distribution of electrons over the finite energy, we obtain the equation. DN / dt0 J (t0 ) is the electron current density of electrons emitted at a time t0.
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