Mobilities of Li+-attached butanol isomers, (n-BuOH) Li+, (s-BuOH) Li+, (i-BuOH) Li+, and (t-BuOH) Li+, in helium gas cooled by liquid nitrogen were measured in reduced electric fields E/N = 8-65 Td. Together with previous measurements at room temperature, the results cover a range of collision energies (epsilon = 10-130 meV). Differences in the mobilities of the isomers became pronounced at low collision energies; for example, (n-BuOH) Li+ showed a mobility about 5% greater than (t-BuOH) Li+ at 10 meV. (C) 2017 Published by Elsevier B.V.