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A two-step model is suggested to explain relative high harmonic efficiency in different atoms and molecules in the multiphoton regime. We discuss the correlation of the high harmonic yield and the static polarizability for systems with nearly the same ionization potential. The comparison of the theoretical estimations with experimental data shows a good agreement.

The simple analytical formula for description of the scattering of ultrashort laser pulse with the shape of the Meyer wavelet by atomic system is obtained. The dependence of the scattered pulse shape as a function of the system spectral width is discussed.Signal, arb.u. Comparison of a short pulse and its approximation with the five Meyer wavelets: a is exact signal, b is approximation of the signal

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