Dissociative multiphoton ionization of NO2 studied by time-resolved imaging
Publication year
2004Source
Journal of Chemical Physics, 121, 16, (2004), pp. 7776-7783ISSN
Publication type
Article / Letter to editor

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Organization
Molecular and Laser Physics
Journal title
Journal of Chemical Physics
Volume
vol. 121
Issue
iss. 16
Page start
p. 7776
Page end
p. 7783
Subject
Molecular and Laser PhysicsAbstract
We have studied dissociative multiphoton ionization of NO2 by time-resolved velocity map imaging in a two-color pump-probe experiment using the 400 and 266 nm harmonics of a regeneratively amplified titanium-sapphire laser. We observe that most of the ion signal appears as NO+ with similar to0.28 eV peak kinetic energy. Approximately 600 fs period oscillations indicative of wave packet motion are also observed in the NO+ decay. We attribute the signal to two competitive mechanisms. The first involving three-photon 400 nm absorption followed by dissociative ionization of the pumped state by a subsequent 266 nm photon. The second involving one-photon 400 nm absorption to the B-2(2) state of NO2 followed by two-photon dissociative ionization at 266 nm. This interpretation is derived from the observation that the total NO+ ion signal exhibits biexponential decay, 0.72 exp(-t/90+/-10)+0.28 exp(-t/4000+/-400), where t is the 266 nm delay in femtoseconds. The fast decay of the majority of the NO+ signal suggests a direct dissociation via the bending mode of the pumped state. (C) 2004 American Institute of Physics.
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