302 citations · 1.1k across the 34 of their papers we have counts for
35 papers · 1 filter
Hybrid basis and multi-center grid method for strong-field processes
Kyle A. Hamer, Heman Gharibnejad, Luca Argenti +1
We present a time-dependent framework that combines a hybrid Gaussian-FEDVR basis with a multicenter grid to simulate strong-field and attosecond dynamics in atoms and molecules. T…
Non-perturbative Effects in Attosecond Four-Wave Mixing Spectra
Sergio Yanez-Pagans, Nathan Harkema, Arvinder Sandhu +2
We study the nonlinear optical response of argon to a four-wave-mixing pulse sequence consisting of an extreme ultraviolet pulse, an overlapping collinear IR and an non-collinear d…
The influence of final state interactions in attosecond photoelectron interferometry
Sizuo Luo, Robin Weissenbilder, Hugo Laurell +14
Fano resonances are ubiquitous phenomena appearing in many fields of physics, e.g. atomic or molecular photoionization, or electron transport in quantum dots. Recently, attosecond…
Two-electron interference in two-photon attosecond double ionization of neon
Siddhartha Chattopadhyay, Carlos Marante, Barry I. Schneider +2
The pump-probe experiments enabled by X-ray free-electron lasers (XFEL) will allow us to directly observe correlated electronic motion with attosecond time resolution by detecting…
Opportunities for Gas-Phase Science at Short-Wavelength Free-Electron Lasers with Undulator-Based Polarization Control
Markus Ilchen, Enrico Allaria, Primož Rebernik Ribič +44
Free-electron lasers (FELs) are the world's most brilliant light sources with rapidly evolving technological capabilities in terms of ultrabright and ultrashort pulses over a large…
Two-photon double ionization with finite pulses: Application of the virtual sequential model to helium
Siddhartha Chattopadhyay, Carlos Marante, Barry Schneider +1
As a step toward the full \emph{ab-initio} description of two-photon double ionization processes, we present a finite-pulse version of the virtual-sequential model for polyelectron…
ASTRA: a Transition-Density-Matrix Approach to Molecular Ionization
Juan Martín Randazzo, Carlos Marante, Siddhartha Chattopadhyay +3
We describe \ASTRA{} (AttoSecond TRAnsitions), a new close-coupling approach to molecular ionization that uses many-body transition density matrices between ionic states with arbit…
Measuring autoionization decay lifetimes of optically forbidden inner valence excited states in neon atoms with attosecond noncollinear four wave mixing spectroscopy
Nicolette G. Puskar, Yen-Cheng Lin, James D. Gaynor +8
Attosecond noncollinear four wave mixing spectroscopy with one attosecond extreme ultraviolet (XUV) pulse and two few-cycle near-infrared (NIR) pulses was used to measure the autoi…
ASTRA, A Transition Density Matrix Approach to the Interaction of Attosecond Radiation with Atoms and Molecules
Juan M Randazzo, Carlos Marante, Siddhartha Chattopadhyay +4
A new formalism and computer code, ASTRA (AttoSecond TRAnsitions), has been developed to treat the interactions of short, intense radiation with molecules. The formalism makes exte…
Autoionizing polaritons with the Jaynes-Cummings model
Coleman Cariker, Sergio Yanez-Pagans, Nathan Harkema +3
Intense laser pulses have the capability to couple resonances in the continuum, leading to the formation of a split pair of autoionizing polaritons. These polaritons can exhibit ex…
Ionic Coherence in Resonant Above-Threshold Attosecond Ionization Spectroscopy
Saad Mehmood, Eva Lindroth, Luca Argenti
The ionization of atoms with sequences of attosecond pulses gives rise to excited ionic states that are entangled with the emitted photoelectron. Still, the ionic ensemble preserve…
Multi-polariton control in attosecond transient absorption of autoionizing states
S. Yanez-Pagans, C. Cariker, M. Shaikh +2
Tunable attosecond transient absorption spectroscopy is an ideal tool for studying and manipulating autoionization dynamics in the continuum. We investigate near-resonant two-photo…
Probing electronic decoherence with high-resolution attosecond photoelectron interferometry
David Busto, Hugo Laurell, Daniel Finkelstein Shapiro +14
Quantum coherence plays a fundamental role in the study and control of ultrafast dynamics in matter. In the case of photoionization, entanglement of the photoelectron with the ion…
Attosecond photoelectron spectroscopy of helium doubly excited states
Luca Argenti, Eva Lindroth
We describe a numerical method that simulates the interaction of the helium atom with sequences of femtosecond and attosecond light pulses. The method, which is based on the close-…
Attosecond Intramolecular-Scattering and Vibronic Delay
Bejan Ghomashi, Nicolas Douguet, Luca Argenti
The photoionization of the CO molecule from the C orbital does not obey the Franck-Condon approximation, as a consequence of the nuclear recoil that accompanies the direct emi…
Autoionizing Polaritons in Attosecond Atomic Ionization
Nathan Harkema, Coleman Cariker, Eva Lindroth +2
Light-induced states are commonly observed in the photoionization spectra of laser-dressed atoms. The properties of autoionizing polaritons, entangled states of light and Auger res…
Towards the complete phase profiling of attosecond wave packets
Jaco Fuchs, Nicolas Douguet, Stefan Donsa +5
Realistic attosecond wave packets have complex profiles that, in dispersive conditions, rapidly broaden or split into multiple components. Such behaviors are encoded in sharp featu…
Coherent control of an Helium-Ion ensemble
Saad Mehmood, Eva Lindroth, Luca Argenti
Attosecond pulses can ionize atoms in a coherent process. Since the emerging fragments are entangled, however, each preserves only a fraction of the initial coherence, thus limitin…
Control of the Ion Polarization in the Pump-Probe Ionization of Helium
Saad Mehmood, Eva Lindroth, Luca Argenti
Attosecond pump-probe ionization process can be used to prepare atomic ions in the coherent superposition of states with opposite parity. The multiphoton shake-up ionization of Hel…
Time delays from one-photon transitions in the continuum
Jaco Fuchs, Nicolas Douguet, Stefan Donsa +5
Attosecond photoionisation time delays reveal information about the potential energy landscape an outgoing electron wavepacket probes upon ionisation. In this study we experimental…
Circular holographic ionization-phase meter
Stefan Donsa, Nicolas Douguet, Joachim Burgdörfer +2
We propose an attosecond XUV-pump IR-probe photoionization protocol that employs pairs of counter-rotating consecutive harmonics and angularly resolved photoelectron detection, the…
Attosecond dynamics through a Fano resonance: Monitoring the birth of a photoelectron
V. Gruson, L. Barreau, Á. Jiménez-Galan +11
Amplitude and phase of wavepackets encode the dynamics of quantum systems. However, the rapidity of electron dynamics on the attosecond timescale has precluded their complete measu…
Resonant Anisotropic Emission in Two-Photon Interferometric Spectroscopy
Bejan Ghomashi, Nicolas Douguet, Luca Argenti
We theoretically explore a variant of RABBITT spectroscopy in which the attosecond-pulse train comprises isolated pairs of consecutive harmonics of the fundamental infrared probe f…
Application of the Complex Kohn Variational Method to Attosecond Spectroscopy
Nicolas Douguet, Barry I. Schneider, Luca Argenti
The complex Kohn variational method is extended to compute light-driven electronic transitions between continuum wavefunctions in atomic and molecular systems. This development ena…