Photoionization in the presence of circularly polarized fundamental and odd-order harmonic fields

Ivanov, Igor; Nam, Chang Hee; Kim, Kyung Taec

doi:10.1103/physreva.95.053401

Cited by 6 publications

(4 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These replicas, however, are prone to be incoherently summed up, because of the entanglement between the laser-ionized electron and its parent molecular ion [21]. Recently, a combination of a circularly polarized laser field and a train of XUV pulses was employed to extract the carrier envelope phase of the latter, analyzing the interference patterns that show up in the photoelectron momentum distributions [22].…”

Section: Introductionmentioning

confidence: 99%

Laser-assisted photoionization: Streaking, sideband, and pulse-train cases

et al. 2020

View full text Add to dashboard Cite

We present a theoretical study of atomic laser-assisted photoionization emission. We consider an atom driven by a linearly polarized extreme ultraviolet laser in two scenarios: (i) a single attosecond pulse (in both the streaking and the sideband regimes) and (ii) an attosecond pulse train. The process takes place assisted by a linearly polarized infrared laser field. In all these cases the energy-and angle-resolved photoelectron spectrum (PES) is determined by a leading contribution, related to the intracycle factor [Gramajo et al., J. Phys. B 51, 055603 ( 2018)], complemented by other ones, derived from the periodicity and symmetry properties of the dipole transition matrix with respect to the infrared field. Each of these terms imprint particular features in the PES that can be straightforwardly understood in terms of generalized energy conservation laws. We investigate in detail these PES structures, in particular, for the case of argon initially in the 3s quantum state. Our theoretical scheme, based on the strong-field approximation, can be applied, however, to other atomic species and field configurations as well.

show abstract

Section: Introductionmentioning

confidence: 99%

Laser-assisted photoionization: Streaking, sideband, and pulse-train cases

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Introducing a time-delay τ between two counterrotating circularly polarized subpulses results in an “unusual kind of Ramsey interference” Ngoko Djiokap et al (2015) , which gives rise to an azimuthal interference pattern in the photoelectron momentum distribution (PMD) forming a multi-armed Archimedean spiral. Atomic FEVs have been studied theoretically employing different numerical methods, including the ab initio solution of the time-dependent Schrödinger equation (TDSE) ( Ngoko Djiokap et al 2015; Ngoko Djiokap et al, 2016 ; Djiokap and Starace., 2017 ; Ngoko Djiokap et al, 2017 ; Ivanov et al, 2017 ; Jia et al, 2019 ; Xiao et al, 2019 ; Bayer et al, 2020 ; Qin et al, 2020 ; Wang et al, 2020 ; Zhen et al, 2020 ; Geng et al, 2020 ; Maxwell et al, 2020 ; Djiokap et al, 2021 ; Geng et al, 2021 ), calculations based on the strong-field approximation ( Hasović et al, 2016 ; Ivanov et al, 2017 ; Li M. et al, 2017 ; Li et al, 2018a ; Li et al, 2018b ; Gazibegović-Busuladžić et al, 2018 ; Kong et al, 2018 ; Li et al, 2019b ; Xiao et al, 2019 ; Geng et al, 2020 ; Maxwell et al 2020 ; Qin et al, 2020 ; Geng et al, 2021 ; Becker and Milošević, 2022) , perturbative analytical approaches ( Ngoko Djiokap et al, 2015; Ngoko Djiokap et al, 2016 ; Djiokap and Starace, 2017 ; Ngoko Djiokap et al, 2017 ; Djiokap et al, 2021 ), emerging techniques such as the

-matrix with time-dependence theory ( Clarke et al, 2018 ; Armstrong et al, 2019 ; Maxwell et al, 2020 ) and semi-classical Monte-Carlo methods ( Ben et al, 2020) . Current research topics comprise the creation of FEVs with odd rotational symmetry using bichromatic pulse sequences ( Ngoko Djiokap et al, 2016) , the study of electron-electron correlations in atomic double-ionization ( Djiokap and Starace, 2017 ; Ngoko Djiokap et al, 2017 ), the influence of the AC-Stark effect on FEVs from strong-field ionization (…”

Section: Introductionmentioning

confidence: 99%

Molecular Free Electron Vortices in Photoionization by Polarization-Tailored Ultrashort Laser Pulses

Bayer

Wollenhaupt

2022

Front. Chem.

View full text Add to dashboard Cite

Atomic and molecular free electron vortices (FEVs), characterized by their spiral-shaped momentum distribution, have recently attracted a great deal of attention due to their varied shapes and their unusual topological properties. Shortly after their theoretical prediction by the single-photon ionization (SPI) of He atoms using pairs of counterrotating circularly polarized attosecond pulses, FEVs have been demonstrated experimentally by the multiphoton ionization (MPI) of alkali atoms using single-color and bichromatic circularly polarized femtosecond pulse sequences. Recently, we reported on the analysis of the experimental results employing a numerical model based on the ab initio solution of the time-dependent Schrödinger equation (TDSE) for a two-dimensional (2D) atom interacting with a polarization-shaped ultrashort laser field. Here, we apply the 2D TDSE model to study molecular FEVs created by SPI and MPI of a diatomic molecule using polarization-tailored single-color and bichromatic femtosecond pulse sequences. We investigate the influence of the coupled electron-nuclear dynamics on the vortex formation dynamics and discuss the effect of CEP- and rotational averaging on the photoelectron momentum distribution. By analyzing how the molecular structure and dynamics is imprinted in the photoelectron spirals, we explore the potential of molecular FEVs for ultrafast spectroscopy.

show abstract

“…However, recent theoretical work has begun to uncover the dynamics of one-and two-electron systems in circularly polarized pulses. In particular, these studies have investigated ionization of hydrogen [25][26][27][28], single-and double-ionization of helium [29][30][31][32], and double ionization of H 2 [33,34]. Studies of strong-field single-ionization of the H + 2 , H 2+ 3 , H 5+ 6 , H 6+ 7 , and HeH 2+ molecular ions in bichromatic, circularly polarized pulses are also becoming available [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Modeling tomographic measurements of photoelectron vortices in counter-rotating circularly polarized laser pulses

et al. 2019

View full text Add to dashboard Cite

Recent experiments [D. Pengel, S. Kerbstadt, L. Englert, T. Bayer, and M. Wollenhaupt, Phys. Rev. A 96 043426 (2017)] have measured the photoelectron momentum distribution for three-photon ionization of potassium by counter-rotating circularly polarized 790-nm laser pulses. The distribution displays spiral vortices, arising from the interference of ionizing wavepackets with different magnetic quantum numbers. The high level of multidimensional detail observed in the distribution makes this an ideal case in which to demonstrate the accuracy of emerging theoretical techniques applicable to such problems. We use the R-matrix with time dependence approach to investigate this process. We calculate the full-dimensional photoelectron momentum distribution, and compare against a set of planar projections of this distribution previously measured in experiment.

show abstract

Photoionization in the presence of circularly polarized fundamental and odd-order harmonic fields

Cited by 6 publications

References 24 publications

Laser-assisted photoionization: Streaking, sideband, and pulse-train cases

Laser-assisted photoionization: Streaking, sideband, and pulse-train cases

Molecular Free Electron Vortices in Photoionization by Polarization-Tailored Ultrashort Laser Pulses

Modeling tomographic measurements of photoelectron vortices in counter-rotating circularly polarized laser pulses

Contact Info

Product

Resources

About