Field-Assisted Dissociative Ionization of CH_2I_2 Induced by Femtosecond Laser Field

摘要

The field-assisted dissociative ionization of CH_2I_2~+ irradiated by a 60-fs 800-nm laser with different laser intensities (1-4 x 10~(14)W/cm~2)is studied both experimentally and theoretically.The different fragmentation patterns are observed in the experiment with a time-of-flight mass spectrometer.In the theoretical aspect,the Gaussian 03 program is applied to calculate the potential energies of CH_2I_2~+ as functions of the C-I and C-H bond distances and I-C-I bond angle under external field with different intensities.The calculations explain our experimental observations well.