tokens: ACKNOWLEDGEMENTS AVN acknowledges the Russian Science Foundation (RSF) grant 16-12-10225. DB, YS, and FL were supported by the ‘Programme National Physique et Chimie du Milieu Interstellaire’ (PCMI) of CNRS/INSU with INC/INP co-funded by CEA and CNES. YS would like to thank support from the Computing Center of the ‘Institut National de Physique Nucléaire’ (IN2P3). We are grateful to Dr. Wan for providing the collisional rate coefficients for H 2 –H 2 collisions.
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