The rotation dynamics of the spin probe TEMPO in glycerol from ESR is compared with the orthopositronium (o -Ps) annihilation from PALS and interpreted using the relaxation dynamics from BDS. Rotation time scale within the slow motion regime exhibits two Arrhenius regions with the characteristic ESR temperature, T-x1(tau) close to the characteristic PALS temperature, T-b1(L), which is related to the secondary beta process above T-g. Next, a slow to fast motion regime transition at the characteristic ESR temperature, T-c(tau) close to the characteristic PALS temperature, T-b2(L), followed by non-Arrhenius fast motion regime region is fully coupled with the primary alpha process. (C) 2017 Elsevier B.V. All rights reserved. (C) 2017 Elsevier B.V. All rights reserved.