1. Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong S.A.R., People's Republic of China, Lebedev Physical Institute, Leninskii Prospect 53, Moscow 119991, Russia, Kurnakov Institute of General and Inorganic Chemistry, Leninskii Prospect 31, Moscow 119991, Russia, and Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia