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tokens: We thank Magnus V. Persson, Thanja Lamberts, Vianney Taquet, Catherine Walsh, and Maria N. Drozdovskaya for interesting discussions. We also thank the referee for his/her comments. Astrochemistry in Leiden is supported by the Netherlands Research School for Astronomy (NOVA), by a Royal Netherlands Academy of Arts and Sciences (KNAW) professor prize, and by the European Union A-ERC grant 291141 CHEMPLAN. K.F. is supported by the Research Fellowship from the Japan Society for the Promotion of Science (JSPS). Numerical computations were, in part, carried out on PC cluster at Center for Computational Astrophysics, National Astronomical Observatory of Japan.