Wikinson, I, Gacia, IA, Whitaker, BJ, Hamard, JB and Blanchet, V (2010) The photodissociation of NO2 by visible and ultraviolet light. Physical Chemistry Chemical Physics, 12 (48). 15766 - 15779 . ISSN 1463-9076
We present velocity map images of the NO, O(P-3(J)) and O(S-1(0)) photofragments from NO2 excited in the range 7.6 to 9.0 eV. The molecule was initially pumped with a visible photon between 2.82-2.95 eV (440-420 nm), below the first dissociation threshold. A second ultraviolet laser with photon energies between 4.77 and 6.05 eV (260-205 nm) was used to pump high-lying excited states of neutral NO2 and/or probe neutral photoproducts. Analysis of the kinetic energy release spectra revealed that the NO photofragments were predominantly formed in their ground electronic state with little kinetic energy. The O(P-3(J)) and O(S-1(0)) kinetic energy distributions were also dominated by kinetically 'cold' fragments. We discuss the possible excitation schemes and conclude that the unstable photoexcited states probed in the experiment were Rydberg states coupled to dissociative valence states. We compare our results with recent time-resolved studies using similar excitation and probe photon energies.
|Institution:||The University of Leeds|
|Academic Units:||The University of Leeds > Faculty of Maths and Physical Sciences (Leeds) > School of Chemistry (Leeds)|
|Depositing User:||Symplectic Publications|
|Date Deposited:||22 Jul 2011 08:54|
|Last Modified:||16 Sep 2016 14:06|
|Publisher:||Royal Society of Chemistry|