Abstract
A detailed investigation has been carried out of ${\mathrm{N}}_{2}$ molecules in intense 55 and $220\phantom{\rule{0.3em}{0ex}}\mathrm{fs}$, linear and circular polarized, $790\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ laser pulses. Using an intensity selective scanning technique, ionization, dissociation, and dissociative ionization channels have been studied. Remarkably similar enhancements of signal with linear polarization observed for double ionization and dissociation channels demonstrate the dominance of dynamic alignment over rescattering effects. Fragmentation energies from dissociative ionization are reasonably well reproduced by classical trajectory calculations, the higher charged fragments displaying evidence of post dissociative ionization.
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