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Title: Kinematical vortices in double photoionization of helium by attosecond pulses

Journal Article · · Physical Review A
 [1];  [2];  [2];  [3];  [4];  [1]
  1. Univ. of Nebraska, Lincoln, NE (United States)
  2. Voronezh State University (Russia)
  3. Univ. of Rochester, NY (United States)
  4. Aarhus Univ. (Denmark)

Two-armed helical vortex structures are predicted in the two-electron momentum distributions produced in double photoionization (DPI) of the He atom by a pair of time-delayed elliptically polarized attosecond pulses with opposite helicities. These predictions are based upon both a first-order perturbation theory analysis and numerical solutions of the two-electron, time-dependent Schrödinger equation in six spatial dimensions. The helical vortex structures originate from Ramsey interference of a pair of ionized two-electron wave packets, each having a total angular momentum of unity, and appear in the sixfold differential DPI probability distribution for any energy partitioning between the two electrons. The vortex structures are exquisitely sensitive to the time delay between the two pulses, their relative phase, their ellipticity, and their handedness; moreover, they occur in a variety of electron detection geometries. However, the vortex structures only occur when the angular separation β = cos-1 (ˆ p1 ∙ ˆ p2) between the electron momenta p1 and p2 is held fixed. The vortex structures can also be observed in the fourfold differential DPI probability distribution obtained by averaging the sixfold differential probability over the emission angles of one electron. Such kinematical vortices are a general phenomenon that may occur in any ionization process, initiated by two time-delayed short pulses with opposite ellipticities, for particular detection geometries.

Research Organization:
Univ. of Nebraska, Lincoln, NE (United States); Univ. of Rochester, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-96ER14646; NA0001944
OSTI ID:
1535746
Alternate ID(s):
OSTI ID: 1368610
Journal Information:
Physical Review A, Vol. 96, Issue 1; ISSN 2469-9926
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 33 works
Citation information provided by
Web of Science

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Cited By (9)

Effects of core space and excitation levels on ground-state correlation and photoionization dynamics of Be and Ne journal February 2019
Two-photon laser-assisted electron scattering on hydrogen atom journal March 2019
Modeling tomographic measurements of photoelectron vortices in counter-rotating circularly polarized laser pulses journal December 2019
Restricted-space ab initio models for double ionization by strong laser pulses journal July 2018
Electron rotational asymmetry in strong-field photodetachment from F by circularly polarized laser pulses journal February 2019
Two-photon laser-assisted electron scattering on Hydrogen atom journal January 2020
Effects of core space and excitation levels on ground-state correlation and photoionization dynamics of Be and Ne text January 2018
Electron rotational asymmetry in strong-field photodetachment from F$^-$ by circularly polarized laser pulses text January 2019
Modeling tomographic measurements of photoelectron vortices in counter-rotating circularly polarized laser pulses text January 2019

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