Field-free molecular alignment probed by the free electron laser in Hamburg (FLASH)

Details Field-free molecular alignment probed by the free electron laser in Hamburg (FLASH) Field-free molecular alignment probed by the free electron laser in Hamburg (FLASH)

2009-02-01

arxiv.org/abs/0902.0171v1

Physics

Atomic Physics

Scientific paper

We report experiments on field-free molecular alignment performed at FLASH, the free electron laser (FEL) in Hamburg. The impulsive alignment induced by a 100 fs near-infrared laser pulse in a rotationally cold CO_2 sample is characterized by ionizing and dissociating the molecules with a time delayed extreme ultra-violet (XUV) FEL pulse. The time-dependent angular distributions of ionic fragments measured by a velocity map imaging spectrometer shows rapid changes associated with the induced rotational dynamics. The experimental results also show hints of a dissociation process that depends non-linearly on the XUV intensity. With samples of aligned molecules at FLASH, experiments using ultrashort XUV pulses become possible in the molecular frame, which will enable new insights into the understanding of molecules and their interactions.

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