Explanipedia

Role of intermediate resonances in attosecond photoelectron interferometry in neon Open

Matteo Moioli, Maria M. Popova, Kathryn R. Hamilton, Dominik Ertel, David Busto , et al. · 2025

Attosecond photoelectron interferometry based on the combination of an attosecond pulse train and a synchronized infrared field is a fundamental technique for the temporal characterization of attosecond waveforms and for the investigation …

Two-Photon Ionization of Single Atoms Localized on the Bessel Beam Axis Open

Maksim D. Kiselev, Elena V. Gryzlova, Maria M. Popova, A.N. Grum-Grzhimailo · 2024

In the article the effect of twisting of Bessel radiation on two-photon ionization of single atoms localized on the axis of the incident beam is studied. The matrix element of two-photon ionization of this type is obtained for arbitrary po…

Role of intermediate resonances in attosecond photoelectron interferometry in neon Open

Matteo Moioli, Maria M. Popova, Kathryn R. Hamilton, Dominik Ertel, David Busto , et al. · 2024

Attosecond photoelectron interferometry based on the combination of an attosecond pulse train and a synchronized infrared field is a fundamental technique for the temporal characterization of attosecond waveforms and for the investigation …

Vector parameters in atomic ionization by twisted light: polarization of electron and residual ion Open

Maksim D. Kiselev, Elena V. Gryzlova, Alexei N. Grum-Grzhimailo · 2023

The electron and ion properties observed in a photoionization inherit a symmetry properties of both a target and a radiation. Introducing a symmetry breaking in a photoionization process one can expect to observe a noticeable variation of …

Angular distribution of photoelectrons generated in atomic ionization by twisted radiation Open

Maksim D. Kiselev, Elena V. Gryzlova, Alexei N. Grum-Grzhimailo · 2023

Until recently, theoretical and experimental studies of photoelectron angular distributions (PADs) including non-dipole effects in atomic photo\-ionization have been performed mainly for the conventional plane-wave radiation. One can expec…

Spectroscopic Peculiarities at Ionization of Excited 2p5(2PJf)3s[K]0,1,2 States of Ne: Cooper Minima and Autoionizing Resonances Open

Maria M. Popova, Maksim D. Kiselev, S. M. Burkov, Elena V. Gryzlova, Alexei N. Grum-Grzhimailo · 2022

An extensive study of photoionization from neon excited states was performed. The R-matrix approach was applied to calculate a photoionization cross-section from the metastable 2p5(2PJf)3s[K]0,2 and dipole-allowed 2p5(2PJf)3s[K]1 states. T…

Influence of an atomic resonance on the coherent control of the photoionization process Open

Elena V. Gryzlova, Paolo Carpeggiani, Maria M. Popova, Maksim D. Kiselev, Nicolas Douguet , et al. · 2022

In coherent control schemes, pathways connecting an initial and a final state can be independently controlled by manipulating the complex amplitudes of their transition matrix elements. For paths characterized by the absorption of multiple…

Evolution of the ionic polarization in multiple sequential ionization: general equations and an illustrative example Open

Elena V. Gryzlova, Alexei N. Grum-Grzhimailo, Maksim D. Kiselev, Maria M. Popova · 2022

The modern Free-Electron-Lasers generate a highly intense polarized radiation which initiate a sequence of ionization and decay events. Their probability depends on the polarization of each state as function of time. Its complete accountin…

An experimental and theoretical study of the Kr 3d correlation satellites Open

Maksim D. Kiselev, Maximilian Reinhardt, Minna Patanen, A. Kivimäki, Ivan Powis , et al. · 2022

The Kr 3d correlation satellites have been studied experimentally by using plane polarized synchrotron radiation to record polarization dependent photoelectron spectra (PES), and theoretically by employing the R-matrix method to calculate …

Mechanisms of 1s Double-Core-Hole Excitation and Decay in Neon Open

Maksim D. Kiselev, Elena V. Gryzlova, S. M. Burkov, Oleg Zatsarinny, Alexei N. Grum-Grzhimailo · 2021

The formation and decay of double-core-hole (DCH) states of the neon ion irradiated by an intense electromagnetic x-ray field are studied theoretically. In the present research DCH formation is the result of sequential absorption of two ph…

Symmetry Violation in Bichromatic Ionization by a Free-Electron Laser: Photoelectron Angular Distribution and Spin Polarization Open

Maria M. Popova, Elena V. Gryzlova, Maksim D. Kiselev, Alexei N. Grum-Grzhimailo · 2021

A fundamental phenomenon of coherent control is investigated theoretically using the example of neon photoionization by the bichromatic field of a free-electron laser. A system exposed to coherent fields with commensurable frequencies lose…

Near-threshold two-photon double ionization of Kr in the vacuum ultraviolet Open

Lazaros Varvarezos, S. Düsterer, Maksim D. Kiselev, Rebecca Boll, Cédric Bomme , et al. · 2021

We report angle-resolved measurements on photoelectrons emitted upon near-threshold two-photon double ionization (TPDI) of Kr irradiated by free-electron laser (FEL) pulses. These photoelectron angular distributions (PADs) are compared wit…

Mapping Resonance Structures in Transient Core-Ionized Atoms Open

Tommaso Mazza, Markus Ilchen, Maksim D. Kiselev, Elena V. Gryzlova, T. Baumann , et al. · 2020

The nature of transient electronic states created by photoabsorption critically determines the dynamics of the subsequently evolving system. Here, we investigate K-shell photoionized atomic neon by absorbing a second photon within the Auge…

Multiple Sequential Ionization of Valence n = 4 Shell of Krypton by Intense Femtosecond XUV Pulses Open

Elena V. Gryzlova, Maksim D. Kiselev, Maria M. Popova, Anton A. Zubekhin, G. Sansone , et al. · 2020

Sequential photoionization of krypton by intense extreme ultraviolet femtosecond pulses is studied theoretically for the photon energies below the 3d excitation threshold. This regime with energetically forbidden Auger decay is characteriz…

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