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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

For further information on related topics, try these sites:

Go to the West Chester University Chemistry Home Page
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