Formation of Highly Rovibrationally Excited Ammonia from Dissociative Recombination of NH4+
Journal article, 2010

The internal energy distribution of ammonia formed in the dissociative recombination (DR) of NH4+ with electrons has been studied by an imaging technique at the ion storage ring CRYRING. The DR process resulted in the formation of NH3 + H (0.90 ± 0.01), with minor contributions from channels producing NH2 + H2 (0.05 ± 0.01) and NH2 + 2H (0.04 ± 0.02). The formed NH3 molecules were highly internally excited, with a mean rovibrational energy of 3.3 ± 0.4 eV, which corresponds to 70% of the energy released in the neutralization process. The internal energy distribution was semiquantitatively reproduced by ab initio direct dynamics simulations, and the calculations suggested that the NH3 molecules are highly vibrationally excited while rotational excitation is limited. The high internal excitation and the translational energy of NH3 and H will influence their subsequent reactivity, an aspect that should be taken into account when developing detailed models of the interstellar medium and ammonia-containing plasmas.

storage ring


imaging technique

internal energy

ammonium ion

dissociative recombination

direct dynamics


Patrik U Andersson

University of Gothenburg

Jenny Öjekull

University of Gothenburg

Jan B. C. Pettersson

University of Gothenburg

Nikola Markovic

Chalmers, Chemical and Biological Engineering, Physical Chemistry

F. Hellberg

Stockholm University

R Thomas

Stockholm University

A. Ehlerding

Stockholm University

F Österdahl

Stockholm University

Vitali Zhaunerchyk

Stockholm University

W. Geppert

Stockholm University

M af Ugglas

Stockholm University

M Larsson

Stockholm University

E. Uggerud

University of Oslo

H Danared

Manne Siegbahn Laboratory

A Källberg

Manne Siegbahn Laboratory

Journal of Physical Chemistry Letters

1948-7185 (eISSN)

Vol. 1 17 2519-2523

Subject Categories

Physical Chemistry



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