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Issue 42, 2007
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Fully state-selected VMI study of the near-threshold photodissociation of NO2: variation of the angular anisotropy parameter

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Abstract

Velocity-map ion imaging (VMI) has been used to study the angular distribution of the NO fragment generated in the photodissociation of NO2 at a variety of photolysis wavelengths. Images were recorded for the channels NO 2Π1/2 (vNO = 0, JNO= 3/2, 11/2 and 21/2) + O (3P2,1), for excitation energies ranging from the onset (Eavl/hc = 0 cm−1) to Eavl/hc ≃ 900 cm−1. The angular anisotropy parameter β was obtained as a function of available energy. Photofragment multiphoton ionization (PHOMPI) spectra were also recorded in the energy range Eavl/hc = 0–300 cm−1 for each of these channels. Large fluctuations of β as a function of Eavl were found in all observed dissociation channels. These variations are discussed in terms of the lifetimes of the originally photoexcited overlapping resonances in the à 2B2 state of NO2, the dynamics of which are strongly influenced by nonadiabatic coupling with the [X with combining tilde] 2A1 state. The potential use of this photolysis process for production of cold oxygen atoms is discussed.

Graphical abstract: Fully state-selected VMI study of the near-threshold photodissociation of NO2: variation of the angular anisotropy parameter

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Publication details

The article was received on 30 Apr 2007, accepted on 22 Aug 2007 and first published on 06 Sep 2007


Article type: Paper
DOI: 10.1039/B706428D
Citation: Phys. Chem. Chem. Phys., 2007,9, 5656-5663
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    Fully state-selected VMI study of the near-threshold photodissociation of NO2: variation of the angular anisotropy parameter

    S. J. Matthews, S. Willitsch and T. P. Softley, Phys. Chem. Chem. Phys., 2007, 9, 5656
    DOI: 10.1039/B706428D

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