Interference-encoded photoionization time delays in the hydrogen atom

Stodolna, Aneta; Lépine, F.; Rouzée, Arnaud; Cohen, S.; Gijsbertsen, A.; Jungmann, Julia H.; Bordas, C.; Vrakking, Marc J. J.

doi:10.1088/1361-6455/aa7d2d

Cited by 7 publications

(29 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In fact, it is expected that the direct contribution will form a strong fringe system that will be modulated by the indirect one. Indeed, this modulation was experimentally observed recently in hydrogen atom [17] and the modulated beating pattern is found to have the form of a checkerboard structure. This structure is also evident in both maps of Figure 2, for the energy range, -0.5<ε<-0.1.…”

Section: Results and Discusionmentioning

confidence: 53%

“…Recently these magnitude oscillations were connected to time delays between pairs of electron trajectories, by using the Eisenbud-Wigner time delay definition [23]. Our Mg results imply that the time delay extraction along the lines suggested in [17] may be applicable to the multielectron case as well 050004-5…”

Section: Results and Discusionmentioning

confidence: 59%

“…We have verified that, in the absence of sharp resonances, occurring in Mg solely near the saddle point energy E sp , this procedure does not alter the characteristics of the map. The map exhibits rich interference fringe structures, the gross features of which can afford a simple semiclassical description [16,17]. For the discussion of the fine details of the map, however, a quantum treatment of the problem is required.…”

Section: Results and Discusionmentioning

confidence: 99%

“…Nevertheless, the description of PM in classical and semiclassical terms would be probably more instructive for the reader. Therefore, we highlight in this section the classical [14,15] and semiclassical [1,2,16,17 ] treatment of the relevant Coulomb-Stark problem. Particularly, it is our aim here to provide those elements that are necessary to identify the main features of a PM image.…”

Section: Theoretical Framework Of Photoionization Microscopymentioning

confidence: 99%

See 3 more Smart Citations

Photoionization microscopy on magnesium atom and comparison with hydrogenic theory

Kalaitzis¹,

Danakas²,

Lépine³

et al. 2019

AIP Conference Proceedings

View full text Add to dashboard Cite

The experimental technique of photoionization microscopy (PM) allows for the measurement of the slow (meV) electron current probability density in the case of atomic photoionization in the presence of a static electric field. The spatial structure of the electron flux (differential cross section), as imaged on a plane detector perpendicular to the field, exhibits a radial and an angular dependence. Here attention is paid to the radial distribution, obtained after angularly integrating the electron flux. We discuss the energy evolution of this quantity in the form of a two-dimensional contour map with the abscissa being the outgoing electron energy and the ordinate being the radius on the detector. As a working example we employ the experimental map recorded during a PM study of the Mg atom. Near-threshold the map reveals quite complex quantum interference and beating patterns. Many of these patterns are also observed in a theoretical map concerning the hydrogen atom and calculated by employing a non-perturbative quantum mechanical treatment. Similarities between the maps which are of "universal" nature are identified, while the observed differences are attributed to the different target atoms, initial states and excitation schemes. Finally, possible applications and directions of further work are also briefly discussed.

show abstract

Section: Results and Discusionmentioning

confidence: 53%

Section: Results and Discusionmentioning

confidence: 59%

Section: Results and Discusionmentioning

confidence: 99%

Section: Theoretical Framework Of Photoionization Microscopymentioning

confidence: 99%

See 2 more Smart Citations

Photoionization microscopy on magnesium atom and comparison with hydrogenic theory

Kalaitzis¹,

Danakas²,

Lépine³

et al. 2019

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…This phenomenology is nowadays suitably studied by photoionization microscopy (PM) [ 1 ], the term denoting a high-resolution experimental technique where the two-dimensional flux of slow (meV) photoelectrons is imaged by a position sensitive detector (PSD). In a first attempt towards the categorization and classification of the above-mentioned phenomenology, photoionization was described in terms of classical particle scattering in conjunction with the source-to-detector trajectories followed by the electrons under the action of the field [ 1,2,3,4,5,6 ]. These studies revealed that the classical differential photoionization cross section exhibits divergences leading to critical scattering effects such as the so-called rainbow and glory scattering [ 7,8,9 ].…”

Section: Introductionmentioning

confidence: 99%

Glory oscillations in photoionization microscopy: Connection with electron dynamics and Stark spectral structures in the continuum

et al. 2020

View full text Add to dashboard Cite

In classical scattering theory, the term "glory scattering" implies the divergence of the classical differential cross section that occurs as soon as the deflection function goes through zero for a nonzero value of the impact parameter. This critical effect also occurs in slow photoelectron imaging where near-threshold atomic photoionization is performed in the presence of an external static electric field. In this case, glory scattering manifests itself by the appearance of an intense peak at the center of the photoelectron momentum distribution. In the present work we examine the magnitude variation of this central peak as a function of electron energy. We experimentally study near-threshold two-photon ionization of ground state magnesium atoms, below as well as above the field-free ionization limit. It is found that, apart from its behavior of classical origin, the glory signal additionally exhibits strong oscillations and beating effects over the full spectral range of the recordings. Of particular interest are its oscillations above the zero-field limit, many aspects of which are expected to be independent of the atomic target. Our results are analyzed with the help of classical, semiclassical and quantum mechanical calculations devoted to the hydrogenic Stark effect. It is theoretically found that these continuum glory oscillations are related to the resonantlike Stark structures appearing under certain conditions in the total photoionization cross section and implying energy quantization in the continuum. The striking outcome of the present study, however, is that both theory and experiment clearly support the connection between the energy-and static field-dependent periodicity of glory oscillations with the classical dynamics of electron motion. In particular, it is shown that the Fourier transform of the glory signal provides information on the differences between the origin-to-detector times of flight corresponding to specific pairs of classical electron trajectories.

show abstract

Glory interference spectroscopy in Sr atom

Ferentinou,

Danakas,

Bordas

et al. 2024

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Interference-encoded photoionization time delays in the hydrogen atom

Cited by 7 publications

References 20 publications

Photoionization microscopy on magnesium atom and comparison with hydrogenic theory

Photoionization microscopy on magnesium atom and comparison with hydrogenic theory

Glory oscillations in photoionization microscopy: Connection with electron dynamics and Stark spectral structures in the continuum

Glory interference spectroscopy in Sr atom

Contact Info

Product

Resources

About