highlight 6 2017

We are currently using Pump-Pump-Probe (PPP) Spectroscopy (Figure A) to study the excited-state dynamics of radical ions.
This is a technique where a first pump pulse triggers a photochemical or photophysical process - here an electron transfer reaction which generates a cation absorbing at 540 nm (Figure B shows the transient absorption of this reaction). A second pump pulse, tuned to the band of interest (in this case the band at 540 nm) is then used at a given delay after the first in order to achieve a transient absorption measurement on the cation with a broadband probe pulse. In this way, anions and cations can be generated by photoinduced electron transfer and then their excited-state dynamics studied. Figure C shows the experiment where a cation prepared by photochemical reaction is studied, and the decay of its ground state bleach observed.

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Eric Vauthey

Physical Chemistry Department - Sciences II - University of Geneva
30, Quai Ernest Ansermet - CH-1211 Geneva 4 (Switzerland)

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