Reemission of ultrashort electromagnetic field pulses by multielectron atoms

Abstract

We develop a method for calculating the spectra of reemission of ultrashort (attosecond and shorter) electromagnetic field pulses by neutral multielectron atoms with a nuclear charge from 1 to 92. The method makes it possible to exactly take into account the spatial nonuniformity of the field of an ultrashort pulse and photon momenta in reemission processes. The results are represented as analytical formulas with several coefficients and screening parameters tabulated for all atoms for which the electron densities can be described by the familiar Dirac-Hartree-Fock-Slater model. By way of example, the spectra of remission of ultrashort electromagnetic field pulses by carbon, silicon, germanium, tin, and lead atoms are calculated.