Frankfurt 2006 – wissenschaftliches Programm
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MO: Molekülphysik
MO 14: Ultrafast IR and Raman Probe and Control
MO 14.8: Vortrag
Montag, 13. März 2006, 18:15–18:30, H12
Local control of molecular fragmentation: the role of orientation — •Philipp Marquetand1, Christoph Meier2, and Volker Engel1 — 1Institut für Physikalische Chemie, Am Hubland, 97074 Würzburg, Germany — 2Laboratoire Collisions, Agrégats et Reactivité, IRSAMC,*Université Paul Sabatier,*31062 Toulouse, France
Local control theory, where the instantaneous response of a system to an external field determines the control field, is employed for the purpose to induce molecular fragmentation processes via infrared (IR) excitation. In particular, the effects of the orientational motion are investigated and compared to the idealized case of a frozen rotation. It is shown that the rotational degree of freedom is crucial for the applicability of the employed local control algorithm. The addition of an additional static electric field which induces a molecular preorientation, offers an efficient way for the local control. In particular, with increasing static field strength, the fragmentation yield approaches unity so that the idealized rotation-less case is recovered. Numerical results are presented for the NaI molecule.