Arrhenius plot for the reaction H₂ + OH   → H₂O + H. The low-temperature fit (blue solid line) was performed using the rate constants calculated using the instanton theory by Meisner & Kästner (2016b). Experimental values are from Ravishankara et al. (1981), Talukdar et al. (1996), and Orkin et al. (2006). The vertical dashed line indicates the lower bound for the recommended temperature range of the UMIST2012 database, T_l = 250 K. Reprinted (modified) with permission from (Meisner & Kästner 2016b), Copyright (2016) American Institute of Physics.