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

Armstrong, Gregory; Clarke, Daniel D. A.; Benda, Jakub; Wragg, Jack; Brown, A. C.; Hart, H. W. van der

doi:10.1103/physreva.100.063416

Cited by 19 publications

(15 citation statements)

References 65 publications

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“…Among the methods capable of accurate description of multielectron dynamics in strong fields is the wellestablished ab initio R-matrix with time-dependence approach (RMT) [20,21]. Until now, RMT has been applied only to processes involving atoms and used to model high harmonic generation [22], to analyze angular distributions of photoelectron momentum in complicated field configurations, including pairs of counterrotating circularly polarized short laser pulses [23,24] and angular streaking [25], and even to processes involving spin-orbit interactions [26]. We note that an alternative implementation of RMT has been applied to H 2 + [27].…”

Section: Introductionmentioning

confidence: 99%

Perturbative and nonperturbative photoionization of H2 and H2O using the molecular R<

et al. 2020

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The ab initio R-matrix with time method has recently been extended to allow simulation of fully nonperturbative multielectron processes in molecules driven by ultrashort arbitrarily polarized strong laser fields. Here we demonstrate the accuracy and capabilities of the current implementation of the method for two targets: We study single-photon and multiphoton ionization of H 2 and one-photon and strong-field ionization of H 2 O and compare the results to available experimental and theoretical data as well as our own time-independent R-matrix calculations. We obtain a highly accurate description of total and state-to-state single-photon ionization of H 2 O and, using a simplified coupled-channel model, we show that state coupling is essential to obtain qualitatively correct results and that its importance as a function of laser intensity changes. We find that electron correlation plays a more important role at low intensities (up to approximately 50 TW/cm 2).

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Section: Introductionmentioning

confidence: 99%

Perturbative and nonperturbative photoionization of H2 and H2O using the molecular R<

et al. 2020

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“…22, where the spiral interference pattern was demonstrated for three-photon ionization of potassium. Calculations using the multielectron ab initio R-Matrix with time dependence (RMT) method fully corroborated this effect, 27 and revealed the three-dimensional characteristics of the interference vortices. Experimental progress in this domain continues to gather pace, and vortex measurements at mid-infrared wavelengths are being carried out.…”

Section: Introductionmentioning

confidence: 79%

“…A more explicit example of twisted electrons in multiphoton processes is the formation of interference vortices. [18][19][20][21][22][23][24][25][26][27] Computations of the momentum distribution of photoelectrons ionized via two time-delayed, counter-rotating circularly-polarized laser elds reveal a Fermat spiral interference pattern. Initially treated theoretically for single-photon ionization 18 and later two-photon ionization 19 of helium, such spirals have since been observed in both single and double ionization of molecules.…”

Section: Introductionmentioning

confidence: 99%

Manipulating twisted electrons in strong-field ionization

et al. 2021

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“…32) have been experimentally demonstrated by bichromatic MPI using time-delayed CRCP pulses [73] and analyzed by TDSE simulations [121]. FEVs have recently attracted much attention, both theoretically [155,[157][158][159][160][161][162][163][164][165][166][167][168][169][170][171][172][173][174] and experimentally [73,[102][103][104]. In this section we discuss our experimental results on the creation and manipulation of FEVs from femtosecond atomic MPI using shaper-generated single-color femtosecond CRCP pulse sequences (Figure 4D).…”

Section: Perturbative Resonance-enhanced Multiphoton Ionizationmentioning

confidence: 99%

Multichromatic Polarization-Controlled Pulse Sequences for Coherent Control of Multiphoton Ionization

et al. 2021

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In this review, we report on recent progress in the generation and application of multichromatic polarization-tailored pulse sequences for the coherent control of multiphoton ionization (MPI) dynamics and present unpublished experimental results that complement our previous findings. Specifically, we utilize single-color, bichromatic, and trichromatic polarization-controlled pulse sequences generated by spectral amplitude, phase and polarization modulation of a carrier-envelope phase (CEP)-stable white light supercontinuum for MPI. The analysis of the number of ionization pathways and the number of distinct final free electron states shows that both increase significantly, but scale differently with the number of absorbed photons and the number of pulses in the sequence. In our experiments, ultrafast polarization shaping is combined with high-resolution photoelectron tomography to generate, control, and reconstruct three-dimensional photoelectron momentum distributions from atomic and molecular MPI. We discuss the use of polarization-controlled single-color and bichromatic pulse sequences in perturbative and non-perturbative coherent control of coupled electron-nuclear dynamics in molecules, atomic spin-orbit wave packet dynamics and the directional photoemission from atoms and chiral molecules. We compare the coherent control of CEP-insensitive intraband multipath interference in the MPI with a fixed number of photons with CEP-sensitive interband multipath interference in the ionization with a different number of photons. The generation and control of free electron vortices with even-numbered rotational symmetry by MPI with single-color pulse sequences is contrasted with the bichromatic control of CEP-sensitive electron vortices with odd-numbered rotational symmetry. To illustrate the potential of multichromatic pulse sequences for coherent control, we present a trichromatic scheme for shaper-based quantum state holography.

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

Cited by 19 publications

References 65 publications

Perturbative and nonperturbative photoionization of H2 and H2O using the molecular R<

Perturbative and nonperturbative photoionization of H2 and H2O using the molecular R<

Manipulating twisted electrons in strong-field ionization

Multichromatic Polarization-Controlled Pulse Sequences for Coherent Control of Multiphoton Ionization

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