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surface science / reaction dynamics / laser photochemistry / laser-surface interactions / nanotechnology / physical chemistry / chemical physics



Ultrafast Surface Photochemistry in the VUVHHG in a tube

This project was part of a TMR Network which you can learn more about here. Being part of a TMR network is often hard work, including walking up snowy mountain roads and skiing. During this work, we built a rather unique machine to study ultrafast (about 1 ps or less) photochemistry in the vacuum ultraviolet regime. A schematic drawing of the apparatus appears below. The required photons were made through a laser-based technique: high harmonic generation with an Ar-ion-pumped Ti:sapphire laser . This laser produces roughly 80 fs pulses at a wavelength near 800 nm. The output of the Ti:sapphire laser is focused into a rare gas that flows out of a tube in a vacuum chamber, as shown in the photo on the right. A nonlinear interaction between the laser field and the atoms in the rare gas jet creates the photons that we are after: ~10-40 eV or 120-30 nm. We studied the photochemistry of  O 2 adsorbed on graphite. This was the first use of HHG to initiate surface photochemistry.

To learn more about lasers, try this tutorial.

HHG Setup


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Go to the West Chester University Chemistry Home Page
Go to the West Chester University Home Page
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