1. Karpov Institute of Physical Chemistry, ul. Obukha, 10, Moscow 107120, Russian Federation
2. Chemistry Department, Moscow State University, Moscow 119899, Russian Federation
3. Laboratoire de Chimie Physique des Matériaux Amorphes, UMR 8611, CNRS, Bâtiment 490, Université Paris XI, 91405, Orsay, France