Dissecting subcycle interference in photoelectron holography

Werby, Nicholas; Maxwell, Andrew S.; Forbes, Ruaridh; Bucksbaum, P. H.; Faria, C. Figueira de Morisson

doi:10.1103/physreva.104.013109

Cited by 22 publications

(41 citation statements)

References 63 publications

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“…A restricted temporal unit cell is necessary for practical purposes, but may introduce some boundary effects. For a complete discussion see [74].…”

Section: Resultsmentioning

confidence: 99%

“…Despite using a monochromatic field, we must restrict the ionization events to a finite temporal range, which introduce some artificial asymmetry depending on how this range is chosen. This can be eliminated by the incoherent averaging procedure described in [74]. In panels (c) and (f), we have consider the CQSFA and a slightly larger ionization potential (Ip = 0.175 a.u.)…”

Section: B Photoelectron Momentum Distributionsmentioning

confidence: 99%

See 1 more Smart Citation

Polarization in Strong-Field Ionization of Excited Helium

Bray,

Maxwell,

Kissin

et al. 2021

Preprint

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We analyze how bound-state excitation, electron exchange and the residual binding potential influence above-threshold ionization (ATI) in Helium prepared in an excited p state, oriented parallel and perpendicular to a linearly polarized mid-IR field. Using ab initio B-spline Algebraic Diagrammatic Construction (ADC), and several one-electron methods with effective potentials, including the Schrödinger solver Qprop, modified versions of the Strong-Field Approximation and the Coulomb-Quantum Orbit Strong-Field Approximation (CQSFA), we find that these specific physical mechanisms leave significant imprints in ATI spectra and photoelectron momentum distributions. Examples are changes of up to two orders of magnitude in the high-energy photoelectron region, and ramp-like structures that can be traced back to Coulomb-distorted trajectories. The present work also shows that electron exchange renders rescattering less effective, causing suppressions in the ATI plateau. Due to the long-range potential, the electron continuum dynamics are no longer confined to the polarization axis, in contrast to the predictions of traditional approaches. Thus, one may in principle probe excited-state configurations perpendicular to the driving-field polarization without the need for orthogonally polarized fields.

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“…A restricted temporal unit cell is necessary for practical purposes, but may introduce some boundary effects. For a complete discussion see [74].…”

Section: Resultsmentioning

confidence: 99%

Section: B Photoelectron Momentum Distributionsmentioning

confidence: 99%

Polarization in Strong-Field Ionization of Excited Helium

Bray,

Maxwell,

Kissin

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…encodes the geometry of the initial electronic orbital, which, in the present publication, we take to be 1s. For other types of orbitals in the CQSFA we refer to [97,[111][112][113].…”

Section: General Expressionsmentioning

confidence: 99%

“…The CQSFA is a path-integral strong-field approach that accounts for the driving field and the residual binding potential on equal footing, and has been applied by us to photoelectron holography by monochromatic fields [106][107][108][109][110][111]. Apart from excellent agreement with experiments [97,112,113], the CQSFA allows unprecedented control about what type of interference leads to specific structures, as specific types of orbits may be switched on and off at will. This article is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

Exploring symmetries in photoelectron holography with two-color linearly polarized fields

Rook,

Faria

2022

Preprint

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We investigate photoelectron holography in bichromatic linearly polarized fields of commensurate frequencies rω and sω, with emphasis on the existing symmetries and for which values of the relative phases between the two driving waves they are kept or broken. We show that there are three types of relevant symmetries: the well-known half-cycle symmetry, which is broken for r + s odd, and reflections around the field crossings and maxima, which may or may not be kept depending on how both waves are dephased. The three symmetries are always present for monochromatic fields, while for bichromatic fields this is not guaranteed, even if r+s is even and the half-cycle symmetry is retained. Breaking the half-cycle symmetry automatically breaks one of the other two, while, if the half-cycle symmetry is retained, the other two symmetries are either both kept or broken. We analyze how these features affect the ionization times and saddle-point equations for different bichromatic fields. We also provide general expressions for the relative phases φ which retain specific symmetries. As an application, we compute photoelectron momentum distributions for ω − 2ω fields with the Coulomb Quantum Orbit Strong-Field approximation and assess how holographic structures such as the fan, the spider and interference carpets behave, focusing on the reflection symmetries. The features encountered can be traced back to the field gradient and amplitude affecting ionization probabilities and quantum interference in different momentum regions.

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“…A restricted temporal unit cell is necessary for practical purposes, but may introduce some boundary effects. For a complete discussion see [79]. For Qprop, we have employed a four-cycle flat-top pulse with additional linear half-cycle turn on and off for the comparison to the CQSFA and SFA models.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Polarization in strong-field ionization of excited helium

Bray

Maxwell

Kissin

et al. 2021

J. Phys. B: At. Mol. Opt. Phys.

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We analyze how bound-state excitation, electron exchange and the residual binding potential influence above-threshold ionization (ATI) in helium prepared in an excited p state, oriented parallel and perpendicular to a linearly polarized mid-IR field. Using the ab initio B-spline algebraic diagrammatic construction (ADC), and several one-electron methods with effective potentials, including the Schrödinger solver Qprop, modified versions of the strong-field approximation and the Coulomb quantum-orbit strong-field approximation (CQSFA), we find that these specific physical mechanisms leave significant imprints in ATI spectra and photoelectron momentum distributions. Examples are changes of up to two orders of magnitude in the high-energy photoelectron region, and ramp-like structures that can be traced back to Coulomb-distorted trajectories. The present work also shows that electron exchange renders rescattering less effective, causing suppressions in the ATI plateau. Due to the long-range potential, the electron continuum dynamics are no longer confined to the polarization axis, in contrast to the predictions of traditional approaches. Thus, one may in principle probe excited-state configurations perpendicular to the driving-field polarization without the need for orthogonally polarized fields.1

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Dissecting subcycle interference in photoelectron holography

Cited by 22 publications

References 63 publications

Polarization in Strong-Field Ionization of Excited Helium

Polarization in Strong-Field Ionization of Excited Helium

Exploring symmetries in photoelectron holography with two-color linearly polarized fields

Polarization in strong-field ionization of excited helium

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