1. Solar System Exploration Division; Code 690; NASA Goddard Space Flight Center; Greenbelt, Maryland 20771 USA
2. Astrochemistry Laboratory; Code 691; NASA Goddard Space Flight Center; Greenbelt, Maryland 20771 USA
3. Chemistry Department; The Catholic University of America; Washington D.C. 20064 USA
4. International Space University; Strasbourg Central Campus 1 Rue Jean-Dominique Cassini, 67400 Illkirch-Graffenstaden France