Letter to the Editor
Effect of rotational excitation of H2 on isotopic exchange reaction with OD− at low temperatures
Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 00 Prague, Czech Republic
Accepted: 21 May 2018
Aims. This paper presents experimentally obtained rate coefficients for the weakly endothermic reaction OD− + H2 → OH− + HD with ortho- and para-hydrogen at astrophysically relevant temperatures between 10 and 300 K.
Methods. The reaction was studied with normal and para-enriched (99.5% para-H2) hydrogen in a 22-pole ion trap. The measured temperature dependencies of reaction rate coefficients are analyzed using a model which assumes that the rotational energies of the two reactants are equivalent to the translational energy in driving the reaction.
Results. At room temperature, the rate coefficients of reactions with both nuclear spin variants reach 7 × 10−11 cm3 s−1, which is in good agreement with the previous results from ion trap and swarm experiments with normal hydrogen. Cooling down the trap slows down the reaction and leads, at a nominal trap temperature of 11 K, to a rate coefficient below 10−14 cm3 s−1 for para-enriched hydrogen. The fitted reaction endothermicity of 25.3 ± 2.2 meV agrees well with the literature value calculated in the Born-Oppenheimer approximation, ΔH0 = 24.0 meV. A simpler evaluation procedure, fitting the data with Arrhenius functions, results in pk = 16.8 × 10−11 exp(−234 K/T) cm3 s−1 for pure para-hydrogen and ok = 9.4 × 10−11 exp(−101 K/T) cm3 s−1 for pure orthohydrogen.
Key words: astrochemistry / molecular data / molecular processes / methods: laboratory: molecular / ISM: molecules
© ESO 2018