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Photon momentum transfer in one-photon single ionization of helium : The influence of electron correlation

Fang, Yong Kang ; Jiang, Wei Chao ; Geng, Lei ; Březinová, Iva ; Sommerlad, Laura ; Tsertsvadze, Alexander ; Kircher, Max ; Kruse, Jan ; Jahnke, Till and Walsh, Noelle LU , et al. (2025) In Physical Review A 111(2).
Abstract

The photon momentum transfer in the one-photon single ionization (1PSI) of helium is theoretically and experimentally studied. The influence of electron correlations is found to be displayed in the dimensionless photon momentum-transfer factor F, which takes a value of 8/5 for the 1PSI of the 1s state of hydrogen. For the ground state of helium, we find that F first decreases and then increases with the energy of the photoelectron, which is drastically different from the monotonic behavior predicted by the mean-field approximation. When resonances due to the doubly excited states are accessible, the parameter shows dramatic fluctuations. We report experimental results for F in the energy region of the (2s2p)1P1 and (2p2)1D2 autoionizing... (More)

The photon momentum transfer in the one-photon single ionization (1PSI) of helium is theoretically and experimentally studied. The influence of electron correlations is found to be displayed in the dimensionless photon momentum-transfer factor F, which takes a value of 8/5 for the 1PSI of the 1s state of hydrogen. For the ground state of helium, we find that F first decreases and then increases with the energy of the photoelectron, which is drastically different from the monotonic behavior predicted by the mean-field approximation. When resonances due to the doubly excited states are accessible, the parameter shows dramatic fluctuations. We report experimental results for F in the energy region of the (2s2p)1P1 and (2p2)1D2 autoionizing states with a photon energy resolution of around 12 meV, a factor of approximately 1.7 better than the resolution reported for the pioneering data of Krässig et al. [Phys. Rev. Lett. 88, 203002 (2002)0031-900710.1103/PhysRevLett.88.203002]. These high-resolution data agree very well with our theoretical predictions. Our study shows that F is sensitive to effects of electron correlations.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review A
volume
111
issue
2
article number
023120
publisher
American Physical Society
external identifiers
  • scopus:85219096528
ISSN
2469-9926
DOI
10.1103/PhysRevA.111.023120
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2025 American Physical Society.
id
40d197a5-2591-4c07-bff9-218d6dcbfc7b
date added to LUP
2025-06-23 14:03:59
date last changed
2025-06-23 14:04:58
@article{40d197a5-2591-4c07-bff9-218d6dcbfc7b,
  abstract     = {{<p>The photon momentum transfer in the one-photon single ionization (1PSI) of helium is theoretically and experimentally studied. The influence of electron correlations is found to be displayed in the dimensionless photon momentum-transfer factor F, which takes a value of 8/5 for the 1PSI of the 1s state of hydrogen. For the ground state of helium, we find that F first decreases and then increases with the energy of the photoelectron, which is drastically different from the monotonic behavior predicted by the mean-field approximation. When resonances due to the doubly excited states are accessible, the parameter shows dramatic fluctuations. We report experimental results for F in the energy region of the (2s2p)1P1 and (2p2)1D2 autoionizing states with a photon energy resolution of around 12 meV, a factor of approximately 1.7 better than the resolution reported for the pioneering data of Krässig et al. [Phys. Rev. Lett. 88, 203002 (2002)0031-900710.1103/PhysRevLett.88.203002]. These high-resolution data agree very well with our theoretical predictions. Our study shows that F is sensitive to effects of electron correlations.</p>}},
  author       = {{Fang, Yong Kang and Jiang, Wei Chao and Geng, Lei and Březinová, Iva and Sommerlad, Laura and Tsertsvadze, Alexander and Kircher, Max and Kruse, Jan and Jahnke, Till and Walsh, Noelle and Dörner, Reinhard and Burgdörfer, Joachim and Peng, Liang You}},
  issn         = {{2469-9926}},
  language     = {{eng}},
  number       = {{2}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review A}},
  title        = {{Photon momentum transfer in one-photon single ionization of helium : The influence of electron correlation}},
  url          = {{http://dx.doi.org/10.1103/PhysRevA.111.023120}},
  doi          = {{10.1103/PhysRevA.111.023120}},
  volume       = {{111}},
  year         = {{2025}},
}