Study on multiphoton ionization mass spectra of 3-picoline in femtosecond laser field

Using 800 nm femtosecond laser as excitation source, the processes and mechanism of multiphoton ionization and dissociation of 3-picoline is studied, and find the process is ionization before dissociation, the possible dissociation channels are analyzed. At B3LYP/6-311 G + + (d, p) level, we calculate the energy of every dissociation channel, the result is consistent with the laser power index of ions based on the experiment. (authors)