Search results for "Time resolved fragmentation"

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Attosecond control of dissociative ionization of O2molecules

2011

We demonstrate that dissociative ionization of O(2) can be controlled by the relative delay between an attosecond pulse train (APT) and a copropagating infrared (IR) field. Our experiments reveal a dependence of both the branching ratios between a range of electronic states and the fragment angular distributions on the extreme ultraviolet (XUV) to IR time delay. The observations go beyond adiabatic propagation of dissociative wave packets on IR-induced quasistatic potential energy curves and are understood in terms of an IR-induced coupling between electronic states in the molecular ion.

PhysicsInfraredAtom and Molecular Physics and OpticsWave packetAttosecondAstrophysics::Cosmology and Extragalactic AstrophysicsElectronic structureMolecular physicsPotential energySettore FIS/03 - Fisica Della MateriaAtomic and Molecular Physics and OpticsTime resolved fragmentationAtomic and Molecular PhysicsExtreme ultravioletIonizationPhysics::Atomic and Molecular ClustersAstrophysics::Solar and Stellar AstrophysicsAstrophysics::Earth and Planetary Astrophysicsand OpticsAtomic physicsAdiabatic processAstrophysics::Galaxy AstrophysicsPhysical Review A
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Real-time observation of a correlation-driven sub 3 fs charge migration in ionised adenine

2021

Sudden ionisation of a relatively large molecule can initiate a correlation-driven process dubbed charge migration, where the electron density distribution is expected to rapidly move along the molecular backbone. Capturing this few-femtosecond or attosecond charge redistribution would represent the real-time observation of electron correlation in a molecule with the enticing prospect of following the energy flow from a single excited electron to the other coupled electrons in the system. Here, we report a time-resolved study of the correlation-driven charge migration process occurring in the nucleic-acid base adenine after ionisation with a 15–35 eV attosecond pulse. We find that the produ…

Time resolved fragmentationSettore FIS/03ddc:540Settore FIS/03 - Fisica Della Materia
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