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We derive an analytical formula for the ionization rate of neutral atoms andmolecules in a strong monochromatic field. Our model is based on thestrong-field approximation with transition amplitudes calculated by an extendedsaddle point method. We show that the present two-term saddle point methodreproduces even complicated structures in angular resolved photo electronspectra

Strong-field ionization of atoms and molecules: The two-term saddle-point method