OH+ Formation in the Low-temperature O+(4S) + H2 Reaction

Formation of OH+ in collisions of ground-state O+(4S) ions with normal H2 has been studied using a variable temperature 22-pole RF ion trap. From 300 to 30 K the measured reaction rate coefficient is temperature-independent, with a small decrease toward 15 K. The recent wave packet calculation predi...

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Bibliographic Details
Published in:The Astrophysical journal 2018-04, Vol.856 (2)
Main Authors: Kovalenko, Artem, Tran, Thuy Dung, Rednyk, Serhiy, Rou ka, Št pán, Dohnal, Petr, Plašil, Radek, Gerlich, Dieter, Glosík, Juraj
Format: Article
Language:English
Subjects:
astrochemistry
Astrophysics
Ions
ISM: molecules
Low temperature
Mathematical analysis
molecular data
molecular processes
Organic chemistry
Temperature dependence
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Summary:Formation of OH+ in collisions of ground-state O+(4S) ions with normal H2 has been studied using a variable temperature 22-pole RF ion trap. From 300 to 30 K the measured reaction rate coefficient is temperature-independent, with a small decrease toward 15 K. The recent wave packet calculation predicts a slightly steeper temperature dependence. The rate coefficients at 300 and 15 K are almost the same, (1.4 0.3) × 10−9 cm3 s−1 and (1.3 0.3) × 10−9 cm3 s−1, respectively. The influence of traces of the two metastable ions, O+(2D) and O+(2P), has been examined by monitoring the H+ products of their reactions with H2, as well as by chemically probing them with N2 reactant gas.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/aab106