0000000000661889

AUTHOR

Francesca Calegari

showing 3 related works from this author

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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Ultrafast dynamics of adenine following XUV ionization

2022

JPhys photonics 4, 034003 (2022). doi:10.1088/2515-7647/ac6ea5 special issue: "Focus on Nanophotonics and Biophotonics for Biomedical and Environmental Applications"

PaperSettore FIS/03ultrafastFocus on Nanophotonics and Biophotonics for Biomedical and Environmental Applicationsdynamicsdissociation530Atomic and Molecular Physics and OpticsSettore FIS/03 - Fisica Della MateriaElectronic Optical and Magnetic MaterialsXUVPhysics::Atomic and Molecular Clustersddc:530Electrical and Electronic EngineeringadeninenucleobaseJOURNAL OF PHYSICS-PHOTONICS
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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 change. Capturing this few-femtosecond/attosecond charge redistribution represents the real-time observation of the electron correlation in the molecule. So far, there has been no experimental evidence of this process. Here we report on a time-resolved study of the correlation-driven charge migration process occurring in the bio-relevant molecule adenine after ionisation by a 15-35 eV attosecond pulse . We find that, the production of intact doubly charged adenine - via a shortly-delayed laser-induced second ionisa…

Chemical Physics (physics.chem-ph)Physics - Chemical PhysicsFOS: Physical sciences
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