Abstract
The dynamic process of laser-induced alignment in Coulomb explosion of N2 has been studied using linearly and circularly polarized, 800 nm, 40 fs Ti:sapphire laser pulses at intensities of 1014 to 1016 W cm−2. The fragment ions produced were observed for the different polarizations with an equal E-field along the detection axis. The intensity-dependent ratio of fragment ion signals has shown that the 40 fs pulses can never align the molecules during the ultrafast interaction at an intensity less than ∼1015 W cm−2, and the dissociative molecular ions start to be aligned at higher intensity. The degree of alignment is increased with an increase in the charge of the dissociative molecular ions.
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