1. Department of Chemistry, National Taiwan University, 1, Roosevelt Rd., Sec. 4, Taipei, Taiwan 106, Fax: +886‐2‐83693765
2. Laboratoire de Chimie Quantique, Institut de Chimie, UMR 7177, 4, rue Blaise Pascal, 67000 Strasbourg, France, Fax: +33‐390‐241‐30
3. Department of Chemistry, National Chung Hsing University, Taichung, Taiwan
4. Institute of Chemistry, Academia Sinica, Taipei, Taiwan 115, Taiwan