TY  - JOUR
A1  - Yin, Zhong
A1  - Rajkovic, Ivan
A1  - Kubicek, Katharina
A1  - Quevedo, Wilson
A1  - Pietzsch, Annette
A1  - Wernet, Philippe
A1  - Föhlisch, Alexander
A1  - Techert, Simone
T1  - Probing the Hofmeister effect with ultrafast core-hole spectroscopy
JF  - The journal of physical chemistry : B, Condensed matter, materials, surfaces, interfaces & biophysical chemistry
N2  - In the current work, X-ray emission spectra of aqueous solutions of different inorganic salts within the Hofmeister series are presented. The results reflect the direct interaction of the ions with the water molecules and therefore, reveal general properties of the salt-water interactions. Within the experimental precision a significant effect of the ions on the water structure has been observed but no ordering according to the structure maker/structure breaker concept could be mirrored in the results indicating that the Hofmeister effect if existent may be caused by more complex interactions.
Y1  - 2014
U6  - https://doi.org/10.1021/jp504577a
SN  - 1520-6106
VL  - 118
IS  - 31
SP  - 9398
EP  - 9403
PB  - American Chemical Society
CY  - Washington
ER  - 
TY  - JOUR
A1  - Schreck, Simon
A1  - Pietzsch, Annette
A1  - Kunnus, Kristjan
A1  - Kennedy, Brian
A1  - Quevedo, Wilson
A1  - Miedema, Piter S.
A1  - Wernet, Philippe
A1  - Föhlisch, Alexander
T1  - Dynamics of the OH group and the electronic structure of liquid alcohols
JF  - Structural dynamics
N2  - In resonant inelastic soft x-ray scattering (RIXS) from molecular and liquid systems, the interplay of ground state structural and core-excited state dynamical contributions leads to complex spectral shapes that partially allow for ambiguous interpretations. In this work, we dissect these contributions in oxygen K-edge RIXS from liquid alcohols. We use the scattering into the electronic ground state as an accurate measure of nuclear dynamics in the intermediate core-excited state of the RIXS process. We determine the characteristic time in the core-excited state until nuclear dynamics give a measurable contribution to the RIXS spectral profiles to tau(dyn) = 1.2 +/- 0.8 fs. By detuning the excitation energy below the absorption resonance we reduce the effective scattering time below sdyn, and hence suppress these dynamical contributions to a minimum. From the corresponding RIXS spectra of liquid methanol, we retrieve the "dynamic-free" density of states and find that it is described solely by the electronic states of the free methanol molecule. From this and from the comparison of normal and deuterated methanol, we conclude that the split peak structure found in the lone-pair emission region at non-resonant excitation originates from dynamics in the O-H bond in the core-excited state. We find no evidence that this split peak feature is a signature of distinct ground state structural complexes in liquid methanol. However, we demonstrate how changes in the hydrogen bond coordination within the series of linear alcohols from methanol to hexanol affect the split peak structure in the liquid alcohols. (C) 2014 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.
Y1  - 2014
U6  - https://doi.org/10.1063/1.4897981
SN  - 2329-7778
VL  - 1
IS  - 5
PB  - American Institute of Physics
CY  - Melville
ER  -