Reactions of C(3P) and C+(2P) with NH3 studied spectroscopically at 
hyperthermal energies

Ottinger, C.; Kowalski, A.

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Reactions of C(³P) and C⁺(²P) with NH₃ studied spectroscopically at hyperthermal energies

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Ottinger, C.
Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Ottinger, C., & Kowalski, A. (2002). Reactions of C(³P) and C⁺(²P) with NH₃ studied spectroscopically at hyperthermal energies. Journal of Physical Chemistry A, 106(36), 8296-8307.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-1759-2

Abstract

Chemiluminescent reactions of C(³P) atoms and C⁺(²P) ions with NH₃ were investigated in the 12-1000 eV_Lab (7-586 eV_CM) energy range, using a beam/gas arrangement. The fast carbon atoms were generated from C⁺(²P) ions by near-resonant charge transfer with CCl₄. The reaction products NH(A ³Π), CN(B ²Σ⁺), and CH(A ²Δ) were studied by means of the NH(A-X), CN(B-X), and CH(A-X) emission spectra at 1.4 and 0.35 nm fwhm resolution. Besides, traces of NH(c¹Π - a ¹Δ), CH(B ²Σ^- - X ²Π), and Balmer line emission were also observed. The reactions were classified as follows: (a) CH(A) is formed by exchange reactions, which are assisted by a hard-sphere-collision mechanism at high energies to moderate the kinetic energy; (b) NH(A) and NH(c) originate at low energies from substitution reactions, and NH(A) also results from collisional dissociation at high energies; (c) CN(B) is formed (only at low energies) via a long-lived [C-NH₃]⁺ complex. Detailed evidence for these assignments came from the observed spectra, which were analyzed by means of a computer simulation, as well as from measurements of the energy-dependent relative cross sections.