Alkali metals in the attosecond pulse train

The problem of sodium and potassium in the attosecond pulse train (APT) as a kicking field is considered. The goal is to investigate the possibility of the kicking field to generate, in general, any secondary radiation. The modifications of the energy bands and the kick-induced currents are examined. Simple local pseudopotentials have been proposed and used. It is demonstrated that the APT generates secondary radiation in a wider spectral range similar to high-order harmonic generation (HHG). This radiation has been found to have a form of periodic complex peak compositions decreasing in intensity with the period approximately equal to the doubled angular frequency of the driving field. This is a new effect. A physical explanation of this effect is given.