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| Layout of the experiment for performing coherent control experiments. Laser pulses are shaped by a liquid crystal modulator before entering three cells. An optical cell measures the shape of the pulse via second-harmonic generation and a photodetector. In the gas phase cell, the laser pulses induce reactions that are characterized by a mass spectrometer. In the liquid phase cell, the pulses induce reactions and competing synthesized compounds (A and B) are characterized by detecting light emission in two photomultiplier tubes. Feedback signals from the three cells are used to adjust the pulse shape and find the optimum pulse for a given reaction. It takes just a matter of minutes to test thousands of different laser pulses. Tests show that laser chemistry can be several times more efficient than traditional synthesis techniques (University of Würzburg). |
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