Abstract
We investigate the generation of high energy x-ray pulses by irradiating metal surfaces at grazing incidence with a powerful laser beam in the simultaneous presence of a strong static negative voltage in order to explain experiments by Farkas et al. (Opt. Commun. 21 (1977) 408; ibid 67 (1988) 124). Using the dipole-layer model proposed recently to describe the multiphoton photo-effect at metal surfaces (Phys. Rev. A 57 (1998) 663; J. Phys. D Appl. Phys. 30 (1997) 3071) we are able to explain the essential features of the above process, in particular its dependence on the strength of the applied voltage and on the power of the used laser field as well as the maximum photon energy emitted. We also present on the basis of our model an estimate of the power of the emitted x-rays in fair agreement with the experimental data.
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