1. Institute for Theoretical ChemistryUniversity of Cologne Greinstr. 4 D‐50939 Cologne Germany
2. Key Laboratory of Theoretical and Computational Photochemistry of Ministry of Education, Department of ChemistryBeijing Normal University Xin‐wai‐da‐jie No. 19 Beijing 10087 China
3. Department of ChemistryUniversity of Illinois at Urbana Champaign Urbana Illinois 61801‐3364