1. ERC,
Inc., and ‡Propellants Branch, Aerospace Systems Directorate, Air Force Research Laboratory, AFRL/RQRP, Edwards Air Force Base, California 93524, United States
2. Department
of Chemistry, University of Idaho, Moscow, Idaho 83844, United States
3. Departments
of Chemistry and Physics, University of California, Berkeley, California 94720, United States
4. Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States