Dissociative multiphoton ionization of NO2 studied by time-resolved imaging
type: Dataset
description: 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 ~0.28 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 2B2 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.
landing page: 0021-9606
keyword: 3380eh-3380gj-3380wz-8250hp-8250pt-8253eb
keyword: chimtheochemical-sciencestheoretical-andor-physical-chemistry
keyword: infoeu-reposemanticsarticle
keyword: journal-articles
keyword: molecule-photon-collisions
keyword: multiphoton-processes
keyword: nitrogen-compounds
keyword: photodissociation
keyword: photoionisation
keyword: time-resolved-spectra
issued: 2026-05-10T06:22:10.439043
modified: 2026-05-10T06:22:10.439047
language: en
contact point: Organization
  fn: CCSD

test_moissonnage_selune
type: Agent

Dissociative multiphoton ionization of NO2 studied by time-resolved imaging
type: Distribution
format: HTML
access URL: https://hal.science/hal-00084734
issued: 2026-05-10T06:22:10.452034
modified: 2026-05-10T06:22:10.425817