Attosecond Frequency Resolved Momentum Imaging of Two-Photon Dissociative Ionization Dynamics of Nitrogen Molecule

Two-photon dissociative ionization processes of nitrogen molecule are investigated with attosecond nonlinear Fourier transformation spectroscopy. Nonlinear absorption spectrum of nitrogen molecule are extracted by measuring interferometric autocorrelation of a-few-pulse attosecond pulse train using nonsequential two-photon processes of nitrogen molecule. The frequency resolved momentum images (FRMI) are reconstructed from the delay dependent momentum images of fragment ion N+ and the resultant FRMIs show the attosecond nonlinear response of nitrogen molecule.