Forthcoming Events

23.01.2019 - 25.01.2019, DESY-Hamburg and European XFEL, Schenefeld, Germany
09.02.2019 - 13.02.2019, Banff Centre, Alberta, Canada

News

New scientific highlights- by MUST PIs Majed Chergui and Steve Johnson
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
Kontext - A radio broadcast with Ursula Keller and Aline Rickli - on leadership positions for women in science (in German)
Nobel Prize in Physics 2018 for groundbreaking inventions: intense ultrafast laser pulses and optical tweezers
Ambizione grant awarded to Elsa Abreu- in Steve Johnson's group
Fabrizio Carbone promoted Associate Professor of Physics- in the EPFL School of Basic Sciences from 1st of August
New scientific highlights- by MUST PIs Ursula Keller, Gebhard Schertler / Jörg Standfuss, Majed Chergui, Peter Hamm
White Paper Photonics Switzerland- presented June 20, 2018 at the Swissmem "Industrietag"

Genuine binding energy of the hydrated electron

April 28, 2017

A combined photoelectron study on water droplets and a liquid water microjet reveals for the first time the influence of electron scattering on the binding energy and the photoelectron anisotropy of the hydrated electron

The unknown influence of inelastic and elastic scattering of slow electrons in water has made it difficult to clarify the role of the solvated electron in radiation chemistry and biology. We combine accurate scattering simulations with experimental photoemission spectroscopy of the hydrated electron in a liquid water microjet, with the aim of resolving ambiguities regarding the influence of electron scattering on binding energy spectra, photoelectron angular distributions, and probing depths. The scattering parameters used in the simulations are retrieved from independent photoemission experiments of water droplets. For the ground-state hydrated electron, we report genuine values devoid of scattering contributions for the vertical binding energy and the anisotropy parameter of 3.7 ± 0.1 eV and 0.6 ± 0.2, respectively. Our probing depths suggest that even vacuum ultraviolet probing is not particularly surface-selective. Our work demonstrates the importance of quantitative scattering simulations for a detailed analysis of key properties of the hydrated electron.
 


Fig. 2 Experimental and simulated photoelectron spectra of eaq. Photoelectron kinetic energy distributions for 12 different ionization laser energies 3.6 eV ≤ hν ≤ 13.6 eV. All spectra are normalized to the same maximum intensity. (A) Experimental spectra. (B) Scattering simulations.

Reference:  Luckhaus, D., Y.-i. Yamamoto, T. Suzuki and R. Signorell (2017). Genuine binding energy of the hydrated electron. Sci. Adv. 3. (10.1126/sciadv.1603224) Luckhaus-2017 (377 KB).

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