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2017 ; 3
(4
): e1603224
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Genuine binding energy of the hydrated electron
#MMPMID28508051
Luckhaus D
; Yamamoto YI
; Suzuki T
; Signorell R
Sci Adv
2017[Apr]; 3
(4
): e1603224
PMID28508051
show ga
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.