title: Observation of enhanced rate coefficients in the H2++H2→H3++H reaction at low collision energies.
abstract: The energy dependence of the rate coefficient of the H2++H2→H3++H reaction has been measured in the range of collision energies between kB⋅10K and kB⋅300mK. A clear deviation of the rate coefficient from the value expected on the basis of the classical Langevin-capture behavior has been observed at collision energies below kB⋅1K, which is attributed to the joint effects of the ion-quadrupole and Coriolis interactions in collisions involving ortho-H2molecules in the  j = 1 rotational level, which make up 75% of the population of the neutral H2molecules in the experiments. The experimental results are compared to very recent predictions by Dashevskaya et al. [J. Chem. Phys. 145, 244315 (2016)], with which they are in agreement.
authors.affiliation: Laboratory of Physical Chemistry, ETH Zurich, Zurich, Switzerland.
authors.forename: Pitt
authors.initials: P
authors.lastname: Allmendinger
authors.affiliation: Laboratory of Physical Chemistry, ETH Zurich, Zurich, Switzerland.
authors.forename: Johannes
authors.initials: J
authors.lastname: Deiglmayr
authors.affiliation: Laboratory of Physical Chemistry, ETH Zurich, Zurich, Switzerland.
authors.forename: Katharina
authors.initials: K
authors.lastname: Höveler
authors.affiliation: Laboratory of Physical Chemistry, ETH Zurich, Zurich, Switzerland.
authors.forename: Otto
authors.initials: O
authors.lastname: Schullian
authors.affiliation: Laboratory of Physical Chemistry, ETH Zurich, Zurich, Switzerland.
authors.forename: Frédéric
authors.initials: F
authors.lastname: Merkt