Few-Femtosecond C<sub>2</sub>H<sub>4</sub><sup>+</sup> Internal Relaxation Dynamics Accessed by Selective Excitation
Matteo Lucchini, Benoît Mignolet, Mario Murari, C. E. M. Gonçalves, Giacinto D. Lucarelli, Fabio Frassetto, Luca Poletto, F. Remacle, M. Nisoli
Abstract
and probe the subsequent fast relaxation with a short infrared pulse. Our results demonstrate that the infrared pulse photoexcites the cationic ground state (GS) to higher excited states, producing a hot GS upon relaxation, which enhances the fragmentation yield. As the photoexcitation probability of the GS strongly depends on the molecular geometry, the probing by the IR pulse provides information about the ultrafast excited-state dynamics and the type of conical intersection (planar or twisted) involved in the first 20 fs of the nonradiative relaxation.
Topics & Concepts
PhotoexcitationConical intersectionExcited stateInternal conversionAtomic physicsExcitationRelaxation (psychology)FemtosecondDissociation (chemistry)Vibrational energy relaxationInfraredGround stateUltrashort pulseFragmentation (computing)ChemistryMolecular physicsPhysicsElectronOpticsLaserPhysical chemistryOperating systemComputer scienceQuantum mechanicsPsychologySocial psychologyLaser-Matter Interactions and ApplicationsSpectroscopy and Quantum Chemical StudiesMass Spectrometry Techniques and Applications