tokens: Acknowledgements We acknowledge financial support from the U.S. National Science Foundation, Grant No. CHE-1565872. JK acknowledges XSEDE.org Grant No. CHE-130120 and University of Maryland High-Performance Deepthought facilities for computational time. FL and SDLP acknowledge the programme ‘Physique et Chimie du Milieu Interstellaire’ (PCMI) of CNRS/INSU with INC/INP co-funded by CEA and CNES. FL and SDLP acknowledge financial support from the Institut Universitaire de France.
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