Abstract
We present measurements of the laser induced spatialalignment of two diatomic molecules, iodine (I2) andbromine (Br2). Dynamic alignment is inferred from theangular distribution of the ionic fragments frommulti-electron dissociative ionization (MEDI). Theangular distributions were determined for different pulsedurations and energies of the short infrared laser pulsesthat induce the MEDI, and were measured using a velocitymap ion imaging detector. The width of the angulardistribution of the fragments with respect to the laserpolarization axis depends only weakly on the laser pulseenergy, and decreases rapidly for longer pulse lengths (afew picoseconds) at constant pulse energy. Theinterpretation of this result in terms of dynamicalignment is supported by an extended field ionizationCoulomb explosion model that includes the rotation of themolecule induced by the laser field.
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