Complete characterization of the constrained geometry bimolecular reaction O({sup 1}D)+N{sub 2}O{yields}NO+NO by three-dimensional velocity map imaging

Journal Article · Fri Aug 07 00:00:00 EDT 2009 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.3194292· OSTI ID:21559759

Goedecke, Niels; Maul, Christof; Kauczok, Sebastian; Gericke, Karl-Heinz ^[1]; Chichinin, Alexey I ^[2]

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1. Institut fuer Physikalische und Theoretische Chemie, Technische Universitaet Braunschweig, Braunschweig (Germany)
2. Institute of Chemical Kinetics and Combustion, Russian Academy of Sciences, Novosibirsk (Russian Federation)

The bimolecular reaction O({sup 1}D)+N{sub 2}O{yields}NO+NO was photoinitiated in the (N{sub 2}O){sub 2} dimer at a wavelength of 193 nm and was investigated by three-dimensional (3D) velocity map imaging. State selective 3D momentum vector distributions were monitored and analyzed. For the first time, kinetic energy resolution and stereodynamic information about the reaction under constrained geometry conditions is available. Directly observable NO products exhibit moderate vibrational excitation and are rotationally and translationally cold. Speed and spatial distributions suggest a pronounced backward scattering of the observed products with respect to the direction of motion of the O({sup 1}D) atom. Forward scattered partner products, which are not directly detectable are also translationally cold, but carry very large internal energy as vibration or rotation. The results confirm and extend previous studies on the complex initiated reaction system. The restricted geometry of the van der Waals complex seems to favor an abstraction reaction of the terminal nitrogen atom by the O({sup 1}D) atom, which is in striking contrast to the behavior observed for the unrestricted gas phase reaction under bulk conditions.

• OSTI ID: 21559759
• Journal Information: Journal of Chemical Physics, Vol. 131, Issue 5; Other Information: DOI: 10.1063/1.3194292; (c) 2009 American Institute of Physics; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATOM-MOLECULE COLLISIONS
ATOMS
COMPLEXES
DIMERS
DISSOCIATION
ENERGY TRANSFER
EXCITATION
KINETIC ENERGY
MOLECULAR STRUCTURE
NITRIC OXIDE
NITROGEN
NITROUS OXIDE
OXYGEN
PHOTOLYSIS
SCATTERING
SPATIAL DISTRIBUTION
THREE-DIMENSIONAL CALCULATIONS
VAN DER WAALS FORCES
VELOCITY
ATOM COLLISIONS
CHALCOGENIDES
CHEMICAL REACTIONS
COLLISIONS
DECOMPOSITION
DISTRIBUTION
ELEMENTS
ENERGY
ENERGY-LEVEL TRANSITIONS
MOLECULE COLLISIONS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS