Ion hydration under pressure.
The pressure dependence of the radial distribution of water oxygen atoms around Rb+ and Br- ions in a diluted RbBr aqueous solution has been investigated by means of x-ray absorption spectroscopy at the Br and Rb K edges up to 2.8 GPa, using a large-volume high-pressure setup developed at a third generation synchrotron radiation facility. Dramatic effects in the anion hydration structure, in particular, are observed, indicating that upon increasing pressure water undergoes a structural transformation which involves considerable molecular reorientation.
Filipponi
Adriano
A
Dipartimento di Fisica, Università degli Studi dell'Aquila, and Istituto Nazionale per la Fisica della Materia, Unità di Ricerca L'Aquila, Italy.
De Panfilis
Simone
S
Oliva
Cecilia
C
Ricci
Maria Antonietta
MA
D'Angelo
Paola
P
Bowron
Daniel T
DT