Hannover 2013 – scientific programme
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MO: Fachverband Molekülphysik
MO 20: SYCD: Interatomic and Intermolecular Coulombic Decay
MO 20.3: Invited Talk
Thursday, March 21, 2013, 12:00–12:30, E 415
ICD-like decays in aqueous electrolytes — •Gunnar Öhrwall1, Niklas Ottosson2,3, and Olle Björneholm2 — 1MAX-lab, Univ. of Lund, Box 118, 22100 Lund, Sweden — 2Dept. of Physics and Astronomy, Univ. of Uppsala, Box 516, 75120 Uppsala, Sweden — 3FOM-institute AMOLF, Science Park 102, 1098 XG Amsterdam, The Netherlands
The first systems where it was predicted that inner valence-ionized states of condensed matter should relax efficiently to delocalized two-hole final states - Interatomic or Intermolecular Coulombic Decay (ICD), were hydrogen-bonded clusters, and recently the phenomenon has been observed following inner-valence ionization in hydrogen-bonded water clusters [1]. In 2005, Öhrwall et al. showed the existence of an ICD-like mechanism following O1s ionization of large water-clusters: In the de-excitation spectrum, features originating from final states delocalized over the ionized molecule and a neighboring molecule were observed, in addition to the normal Auger final states localized on the ionized species [2]. This has later also been observed in O1s ionization of liquid water.
Here, I will show examples of ICD-like decays in core-ionized aqueous ions, and in water molecules in aqueous electrolytes. I will also discuss how the efficiency for such decays depends on factors such as charge, polarizability, and solvated radius of the ionic solutes [3].
References [1] M. Mucke et al., Nat. Phys. 6 (2010) 143. [2] G. Öhrwall et al., J. Chem. Phys. 123 (2005) 054310. [3] N. Ottosson, G. Öhrwall, and O. Björneholm, Chem. Phys. Lett. 543 (2012) 1.