Femtosecond multiphoton ionization dynamics of N 2 is studied by using ve‐locity map imaging technique and 70 fs laser at 410 nm from 1 to 3 × 10 14 W/cm 2 . The kinetic energy and angular distributions of photoelectron are measured and ana‐lyzed .The insensitivity of the photoelectron energy to peak laser intensities suggests that the electrons actually result from a two‐step process ,indicative of the occur‐rence of real population in the intermediate states .The real population transfer con‐sists of two parts :resonant population trans...
