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the liquid side

ultrafast one and two dimensional vibrational spectroscopy on chemical reaction dynamics in liquids

Ultrafast vibrational spectroscopy is used to monitor chemical reactions on the femtosecond and picosecond time-scales. One narrowband ultrafast IR laser pulse excites vibrational modes in a molecule and is followed by a second broadband infrared pulse, which gives two independent frequency axes and allows the collection of 2D-IR spectra. These spectra provide direct information on vibrational anharmonicties, energy transfer processes, and molecular structure. This technique is used to study ultrafast fluxional processes in liquids as well as the photoinduced reactions of transition-metal complexes following photoexcitation with an ultrafast UV or visible laser pulse.

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the surface side

ultrafast electron dynamics at metal/dielectric interfaces using two photon photoemission

The femtosecond dynamics of electrons at the interface between Ag(111) and variable monolayers of an organic adsorbate are studied with a two-color femtosecond ultrafast laser system. One laser pulse promotes electrons to an electronic state outside the metal, and the second pulse subsequently photoemits the electron. This techniques provides a direct method to investigate the fundamental properties of charge dynamics of interesting and device-relevant molecules at a metal interface.

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