1. Department of Chemistry, Saint Louis University, 3501 Laclede Avenue, Saint Louis, Missouri 63103, United States
2. University of Dayton Research Institute, Sensors Technology Office, Dayton, Ohio 45469, United States
3. Air Force Research Laboratory, Propulsion Directorate, Wright-Patterson Air Force Base, Dayton, Ohio 45433, United States
4. Department of Chemistry, Washington University, One Brookings Drive, Saint Louis, Missouri 63130, United States