Effect of electronic angular momentum exchange on photoelectron anisotropy following the two-color ionization of krypton atoms

Saquet, Nicolas; Holland, D.M.P.; Pratt, S. T.; Cubaynes, D.; Tang, Xiaofeng; Garcı́a, Gustavo; Nahon, Laurent; Reid, Katharine L.

doi:10.1103/physreva.93.033419

Cited by 5 publications

(4 citation statements)

References 34 publications

(36 reference statements)

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“…Lastly, the Ar(3p 1 ) PMD in Fig. 5(c) shows a suppression of electron density in both parallel and perpendicular directions to the laser polarization, resulting in a four-lobe structure; this is consistent with the recent p-state measurement of the PMD of krypton atoms during a two-photon ionization (13-eV excitation, followed by a 595-nm linearly-polarized laser pulse) [37].…”

Section: Argonsupporting

confidence: 89%

Multielectron effects in the photoelectron momentum distribution of noble-gas atoms driven by visible-to-infrared-frequency laser pulses: A time-dependent density-functional-theory approach

2017

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We present the photoelectron momentum distributions (PMDs) of helium (He), neon (Ne) and argon (Ar) atoms driven by a linearly-polarized, visible (527 nm) or near-infrared (800 nm) laser pulse (20 optical cycles in duration), based on the time-dependent density functional theory (TDDFT) under the local density approximation with a self-interaction correction. A set of time-dependent Kohn-Sham equations for all electrons in an atom is numerically solved using the generalized pseudospectral method. An effect of the electron-electron interaction driven by a visible laser field is not recognizable in the He and Ne PMDs except for a reduction of the overall photoelectron yield, but there is a clear difference between the PMDs of an Ar atom calculated with the frozen-core approximation and the TDDFT, indicating an interference of its M-shell wavefunctions during the ionization. Furthermore, we find that the PMDs of degenerate p-states are well separated in intensity when driven by a near-infared laser field, so that the single-active-electron approximation can be adapted safely.

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Section: Argonsupporting

confidence: 89%

Multielectron effects in the photoelectron momentum distribution of noble-gas atoms driven by visible-to-infrared-frequency laser pulses: A time-dependent density-functional-theory approach

2017

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“…2. Compared to ions, the extraction dynamics for electrons are more complex due to their larger sensitivity to the magnetic field of the MOT. A comprehensive analysis of an electron beam from a MOT requires not only electron-imaging on a spatially resolving detector 12,13 but also a simultaneous measurement of the temporal beam properties. In this paper, we report the experiment of this kind.…”

mentioning

confidence: 99%

Extraction dynamics of electrons from magneto-optically trapped atoms

Fedchenko

Chernov

McCulloch

et al. 2017

Applied Physics Letters

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Pulsed photoionization of laser-cooled atoms in a magneto-optical trap (MOT) has the potential to create cold electron beams of few meV bandwidths and few ps pulse lengths. Such a source would be highly attractive for the study of fast low-energy processes like coherent phonon excitation. To study the suitability of MOT-based sources for the production of simultaneously cold and fast electrons, we study the photoionization dynamics of trapped Cs atoms. A momentum-microscope-like setup with a delay-line detector allows for the simultaneous measurement of spatial and temporal electron distributions. The measured patterns are complex, due to the Lorentz force inducing spiral trajectories. Ray-tracing simulations reproduce the main features. We find that the production of electron bunches with bandwidths of a few meV is straightforward; however, pulses in the ps-range are more demanding and require beam blanking or partial blocking.

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“…We anticipate further developments in XUV photoionization experiments using free-electron lasers, which would help us develop TDDFT beyond the adiabatic approximation. Another promising technique to observe multi-electron PMDs is to use a combination of synchrotron radiation and narrow-bandwidth, tabletop laser systems to induce two-photon ionization, as was done very recently at SOLEIL facility [48]. In the future, we intend to study effects of driving-laser polarizations in PMDs of atoms to verify their findings.…”

Section: Discussionmentioning

confidence: 98%

Photoelectron momentum distribution of ground- and excited-state lithium atoms induced by extreme-ultraviolet photon absorption

Murakami

Zhang

Telnov

et al. 2018

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

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We perform a theoretical investigation of the photoelectron momentum distribution (PMD) after ionization of a lithium (Li) atom, initially prepared in the ground (1s 2 2s) or excited (1s 2 2p) state, by extreme ultraviolet (XUV) radiation of frequency 85 eV that was previously measured in an experiment with the free-electron laser in Hamburg (2009 Phys. Rev. Lett. 103 103008). The experiment revealed three distinct peaks in PMD with absolute momentum values of 2.4, 1.2 and 0.8 atomic units (a.u.), respectively. We carry out an all-electron calculation based on time-dependent density functional theory (TDDFT) and find that the two outer PMD peaks (2.4 and 1.2 a.u.) are well described by the single ionization from the valence (2s) and core (1s) electron shells, while the innermost peak (0.8 a.u.) is not reproduced. However, the peak at this position is found in the TDDFT calculation of a Li + ion (1s 2 ) subject to the same XUV radiation, thus the TDDFT calculations are in good agreement with the experimental measurements if one assumes that the innermost peak originates from a Li + ion rather than a neutral atom. We estimate possible production of Li + ions by the pumping infrared laser used in the experiment to prepare the target atoms in the 1s 2 2p excited state prior to interaction with the XUV field.

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Effect of electronic angular momentum exchange on photoelectron anisotropy following the two-color ionization of krypton atoms

Abstract: We present photoelectron energy and angular distributions for resonant two-photon ionization via several low-lying Rydberg states of atomic Kr. The experiments were performed by using synchrotron radiation to pump the Rydberg states and a continuous wave laser to probe them.

Cited by 5 publications

References 34 publications

Multielectron effects in the photoelectron momentum distribution of noble-gas atoms driven by visible-to-infrared-frequency laser pulses: A time-dependent density-functional-theory approach

Multielectron effects in the photoelectron momentum distribution of noble-gas atoms driven by visible-to-infrared-frequency laser pulses: A time-dependent density-functional-theory approach

Extraction dynamics of electrons from magneto-optically trapped atoms

Photoelectron momentum distribution of ground- and excited-state lithium atoms induced by extreme-ultraviolet photon absorption

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