Molecular synthesis in interstellar clouds: the radiative association reaction H + OH -> H2O + h

Formation of H 3− by radiative association of H 2 and H− in the interstellar medium

Atom Tunneling in the Water Formation Reaction H2 + OH → H2O + H on an Ice Surface

OH radicals play a key role as an intermediate in the water formation chemistry of the interstellar medium. For example the reaction of OH radicals with H2 molecules is among the final steps in the astrochemical reaction network starting from O, O2, and O3. Experimentally it was shown that even at 10 K this reaction occurs on ice surfaces. As the reaction has a high activation energy only atom ...

Full-dimensional quantum mechanical calculation of the rate constant for the H2+OH H2O+H reaction

The cumulative reaction probability (CRP) (the Boltzmann average of which is the thermal rate constant) has been calculated for the reaction H,+OH++HzO+H in its full (six) dimensionality for total angular momentum J=O. The calculation, which should be the (numerically) exact result for the assumed potential energy surface, was carried out by a direct procedure that avoids having to solve the co...

Herschel/HIFI observations of interstellar OH and H2O towards W49N : a probe of diffuse clouds with a small molecular fraction

We report the detection of absorption by interstellar hydroxyl cations and water cations, along the sight-line to the bright continuum source W49N. We have used Herschel’s HIFI instrument, in dual beam switch mode, to observe the 972 GHz N = 1–0 transition of OH and the 1115 GHz 111−000 transition of ortho-H2O. The resultant spectra show absorption by ortho-H2O, and strong absorption by OH, in ...

Quantum mechanical reaction rate constants by vibrational configuration interaction: the OH + H2->H2O + H reaction as a function of temperature.

The thermal rate constant of the 3D OH + H(2)-->H(2)O + H reaction was computed by using the flux autocorrelation function, with a time-independent square-integrable basis set. Two modes that actively participate in bond making and bond breaking were treated by using 2D distributed Gaussian functions, and the remaining (nonreactive) modes were treated by using harmonic oscillator functions. The...