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.
Ion Hydration under Pressure / Filipponi, Adriano; De Panfilis, Simone; Oliva, Cecilia; Ricci, Maria Antonietta; D'Angelo, Paola; Bowron, Daniel T. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 91:16(2003), pp. 165505-165508. [10.1103/PhysRevLett.91.165505]
Ion Hydration under Pressure
De Panfilis, Simone;Ricci, Maria Antonietta;D'Angelo, Paola;
2003
Abstract
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
