1. University of Illinois Urbana−Champaign, Department of Chemistry, 601 South Mathews Avenue, Urbana, Illinois 61801, United States
2. Carroll University, 100 North East Avenue, Waukesha, Wisconsin, 53186, United States
3. University of Illinois Urbana−Champaign, Department of Mathematics, 1409 West Green Street, Urbana, Illinois 61801, United States