Forthcoming Events

02.06.2019 - 06.06.2019, Centro Congressi Abruzzo Berti Hotels", Silvi Marina (TE), Italy
17.06.2019 - 21.06.2019, Center for Free-Electron Laser Science (CFEL) at DESY , Hamburg, Germany
21.06.2019 - 26.06.2019, University of Colorado, Boulder, USA


New scientific highlights- by MUST PIs Fabrizio Carbone and Ursula Keller (with Sasha Landsman and Cornelia Hofmann)
Proof of concept ERC Grant for Rachel Grange Automated super-resolution polarimetric nonlinear microscope (PolarNon)
Majed Chergui wins RSC Liversidge Award from the Royal Society of Chemistry
New scientific highlights- by MUST PIs Peter Hamm, Majed Chergui, Urs Staub, Steve Johnson, Jörg Standfuss and Gebhard Schertler
The FP-RESOMUS Grant Agreement- now signed by the ETH Zürich and the European Commission
Cluster of Excellence RESOLV extended- our partner in FP-RESOMUS and the biannual Science and Gender Meetings

Peter Hamm and co-workers: time-resolved terahertz spectroscopy captures the early stages of the photodetached electron and furthermore provides a direct measure of its initial size

July 6, 2014

Direct Observation of the Collapse of the Delocalized Excess Electron in Water

It is generally assumed that the hydrated electron occupies a quasi-spherical cavity surrounded by only a few water molecules in its equilibrated state. However, in the very moment of its generation, before water has had time to respond to the extra charge, it is expected to be significantly larger in size. According to a particle-in-a-box picture, the frequency of its absorption spectrum is a sensitive measure of the initial size of the electronic wavefunction. Here, using transient terahertz spectroscopy, we show that the excess electron initially absorbs in the far-infrared at a frequency for which accompanying ab initio molecular dynamics simulations estimate an initial delocalization length of ≈40 Å. The electron subsequently shrinks due to solvation and thereby leaves the terahertz observation window very quickly, within ≈200 fs.

Publication: J. Savolainen, F. Uhlig, S. Ahmed, P. Hamm and P. Jungwirth (2014) Direct Observation of the Collapse of the Delocalized Excess Electron in Water, Nature Chem 6, 697-701 (10.1038/nchem.1995)

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