tokens: This work was supported by NASA’s Planetary Science Division Internal Scientist Funding Program through the Fundamental Laboratory Research (FLaRe) work package at the NASA Goddard Space Flight Center. Also acknowledged is the NASA Astrobiology Institute through funding to the Goddard Center for Astrobiology under proposal 13-13NAI7-0032. Stephen Brown, Eugene Gerashchenko, and Martin Carts of NASA Goddard’s Radiation Effects Facility are thanked for the operation and maintenance of the Van de Graaff accelerator. Many helpful conversations with Marla Moore and Perry Gerakines are acknowledged.
ner_tags: O O O O O B-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant O O B-Grant I-Grant I-Grant B-Grant O O O O B-Organization I-Organization I-Organization I-Organization I-Organization O O O O B-Organization I-Organization I-Organization O O O O B-Organization I-Organization I-Organization I-Organization O B-Proposal I-Proposal B-Person I-Person B-Person I-Person O B-Person I-Person O B-Organization I-Organization I-Organization I-Organization I-Organization O O O O O O O O O B-Instrument I-Instrument I-Instrument I-Instrument O O O O B-Person I-Person O B-Person I-Person O O