1. State Key Laboratory of Chemical Biology and Drug Discovery; Department of Applied Biology and Chemical Technology; The Hong Kong Polytechnic University; Hunghom Kowloon Hong Kong China
2. Department of Applied Physics; The Hong Kong Polytechnic University; Hunghom Kowloon Hong Kong China
3. Departamento de Química Física y Centro Singular de Investigaciones Biomédicas (CINBIO); Universidad de Vigo; Vigo Spain
4. Institute of Applied Physics and Computational Mathematics; P. O. Box 8009(28) Beijing 100088 P. R. China