1. Department
of Chemistry and the PULSE Institute, Stanford University, Stanford, California 94305, United States
2. SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
3. Department
of Chemistry and Biochemistry, City College of New York, New York, New York 10031, United States
4. Center
for Computational Molecular Science and Technology, School of Chemistry
and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States