Manipulating slow photoelectron wave packets by rotation of the linear laser polarization

Kalaitzis, P.; Danakas, S.; Bordas, C.; Cohen, S.

doi:10.1103/physreva.108.013106

Cited by 2 publications

(3 citation statements)

References 67 publications

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“…The Schrödinger equation's solution for the near-thresholdexcited hydrogen atom in the presence of a homogeneous static electric field F = Fz was abundantly described in earlier works [9][10][11]. Therefore its description here will be brief, emphasizing solely on the specific features concerning the glory effect and some necessary extensions regarding multielectron atoms.…”

Section: Theoretical Descriptionmentioning

confidence: 99%

“…The dimensionless parameter Λ appearing in equation ( 15) denotes the relative strength between the radial matrix elements [10] corresponding to the transitions |vp⟩ → |ns⟩ and |vp⟩ → |nd⟩, respectively.…”

Section: Theoretical Descriptionmentioning

confidence: 99%

“…The latter is nowadays efficiently complemented by means of threshold photoelectron imaging spectroscopy, where the two-dimensional slow electron flux is projected (imaged) on a position sensitive detector (PSD), which brings an additional dimension to the experimental data. It is by now well understood that, apart from its possible applications in surface characterization [1], slow photoelectron imaging [2,3] can provide information on the wavefunctions of continuum [4] and quasibound [5,6] atomic Stark states, photoelectron momentum distributions transversely to the DC field [3,[7][8][9] and the manipulation of Stark wavepackets by means of the laser polarization [10].…”

Section: Introductionmentioning

confidence: 99%

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Glory interference spectroscopy in Sr atom

Ferentinou,

Danakas,

Bordas

et al. 2024

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

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Slow (meV) photoelectron imaging spectroscopy is employed in the experimental study of near-threshold photoionization of strontium atoms in the presence of an external static electric field. Specifically, the study is devoted to the glory effect, that is, the appearance of an intense peak at the center of the recorded photoelectron images, when dealing with m=0 final ionized Stark states (m denoting the magnetic quantum number). This critical effect is formally identical to that encountered in classical scattering theory, where, for a nonzero value of the impact parameter, the zero-crossing of the deflection function leads to a divergent classical differential cross section. By re-cording the magnitude variation of this glory peak as a function of electron excitation energy, we observe that, besides the traces of classical origin, it also exhibits intense quantum interference and beating phenomena, above and below the zero-static-field ionization threshold. We study both, single- and two-photon ionization of Sr, thus enabling a comparison not only between the different excitation schemes, but also with an earlier work devoted to two-photon ionization of Mg atom by Kalaitzis et al (2020 Phys. Rev. A 102, 033101). Our recordings are analyzed within the framework of the Harmin-Fano frame transformation Stark effect theory that is applied to both the hydrogen atom and a non-hydrogenic one simulating Sr. We discuss the various aspects of the recorded and calculated glory interference and beating structures and their “short time Fourier transforms” and classify them as either atom-specific or atom independent. In particular, we verify the “universal” connection between the glory oscillations above the zero-field threshold and the differences be-tween the origin-to-detector times of flight corresponding to pairs of classical electron trajectories that end up to the image center.

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Section: Theoretical Descriptionmentioning

confidence: 99%

Section: Theoretical Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Glory interference spectroscopy in Sr atom

Ferentinou,

Danakas,

Bordas

et al. 2024

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

Self Cite

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Fourier–Hankel–Abel Nyquist-limited tomography: A spherical harmonic basis function approach to tomographic velocity-map image reconstruction

Sparling,

Rajak,

Blanchet

et al. 2024

Review of Scientific Instruments

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A new method for the fully generalized reconstruction of three-dimensional (3D) photoproduct distributions from velocity-map imaging (VMI) projection data is presented. This approach, dubbed Fourier–Hankel–Abel Nyquist-limited TOMography (FHANTOM), builds on recent previous work in tomographic image reconstruction [C. Sparling and D. Townsend, J. Chem. Phys. 157, 114201 (2022)] and takes advantage of the fact that the distributions produced in typical VMI experiments can be simply described as a sum over a small number of spherical harmonic functions. Knowing the solution is constrained in this way dramatically simplifies the reconstruction process and leads to a considerable reduction in the number of projections required for robust tomographic analysis. Our new method significantly extends basis set expansion approaches previously developed for the reconstruction of photoproduct distributions possessing an axis of cylindrical symmetry. FHANTOM, however, can be applied generally to any distribution—cylindrically symmetric or otherwise—that can be suitably described by an expansion in spherical harmonics. Using both simulated and real experimental data, this new approach is tested and benchmarked against other tomographic reconstruction strategies. In particular, the reconstruction of photoelectron angular distributions recorded in a strong-field ionization regime—marked by their extensive expansion in terms of spherical harmonics—serves as a key test of the FHANTOM methodology. With the increasing use of exotic optical polarization geometries in photoionization experiments, it is anticipated that FHANTOM and related reconstruction techniques will provide an easily accessible and relatively low-cost alternative to more advanced 3D-VMI spectrometers.

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Manipulating slow photoelectron wave packets by rotation of the linear laser polarization

Cited by 2 publications

References 67 publications

Glory interference spectroscopy in Sr atom

Glory interference spectroscopy in Sr atom

Fourier–Hankel–Abel Nyquist-limited tomography: A spherical harmonic basis function approach to tomographic velocity-map image reconstruction

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