Abstract
The angular distributions of ionic fragments produced bymulti-electron dissociative ionization of diatomicmolecules are calculated using a field-ionization Coulombexplosion model that includes dynamic rotation of themolecule in the laser field. The majority of dynamicalignment occurs on the leading edge of the laser pulseat low intensities before the laser intensity reaches thedissociative ionization threshold. This makes the degreeof alignment sensitive to the precise value of thedissociative ionization threshold. Measuring the totalion signal for different pulse-lengths enablesangle-dependent dissociative ionization to bedistinguished from dynamic alignment. Increasedalignment with long pulses is an unambiguous sign thatthe molecules are forced into alignment with laser field.
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