1. Department of Chemistry, Union College, Schenectady, New York 12308, United States
2. Department of Astronomy, University of Virginia, Charlottesville, Virginia 22904, United States
3. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
4. National Radio Astronomy Observatory, Charlottesville, Virginia 22903, United States
5. Center for Astrophysics | Harvard & Smithsonian, Cambridge, Massachusetts 02138, United States
6. Astrochemistry Laboratory and the Goddard Center for Astrobiology, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, United States
7. Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904, United States
8. Department of Physics, Wellesley College, 106 Central Street, Wellesley, Massachusetts 02481, United States
9. Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada