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Attosecond delays in laser-assisted photodetachment from closed-shell negative ions

Lindroth, Eva and Dahlström, Jan Marcus LU (2017) In Physical Review A 96(1).
Abstract
We study laser-assisted photodetachment time delays by attosecond pulse trains from the closed-shell negative ions F− and Cl−. We investigate the separability of the delay into two contributions: (i) the Wigner-like delay associated with one-photon ionization by the attosecond pulse train and (ii) the delay associated with the exchange of an additional laser photon in the presence of the potential of the remaining target. Based on the asymptotic form of the wave packet, the latter term is expected to be negligible because the ion is neutralized, leading to a vanishing laser-ion interaction with increasing electron-atom separation. While this asymptotic behavior is verified at high photoelectron energies, we also quantify sharp deviations... (More)
We study laser-assisted photodetachment time delays by attosecond pulse trains from the closed-shell negative ions F− and Cl−. We investigate the separability of the delay into two contributions: (i) the Wigner-like delay associated with one-photon ionization by the attosecond pulse train and (ii) the delay associated with the exchange of an additional laser photon in the presence of the potential of the remaining target. Based on the asymptotic form of the wave packet, the latter term is expected to be negligible because the ion is neutralized, leading to a vanishing laser-ion interaction with increasing electron-atom separation. While this asymptotic behavior is verified at high photoelectron energies, we also quantify sharp deviations at low photoelectron energies. Further, these low-energy delays are clearly different for the two studied anions, indicating a breakdown of the universality of laser-ion-induced delays. The fact that the short-range potential can induce a delay of as much as 50 as can have implications for the interpretation of delay measurements also in other systems that lack long-range potential. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review A
volume
96
issue
1
publisher
American Physical Society
external identifiers
  • scopus:85026892034
ISSN
2469-9926
DOI
10.1103/PhysRevA.96.013420
language
English
LU publication?
no
id
5c936d3a-5105-4236-86f5-46c7d997889f
alternative location
http://link.aps.org/doi/10.1103/PhysRevA.96.013420
date added to LUP
2019-05-09 13:37:36
date last changed
2019-12-03 02:08:18
@article{5c936d3a-5105-4236-86f5-46c7d997889f,
  abstract     = {We study laser-assisted photodetachment time delays by attosecond pulse trains from the closed-shell negative ions F− and Cl−. We investigate the separability of the delay into two contributions: (i) the Wigner-like delay associated with one-photon ionization by the attosecond pulse train and (ii) the delay associated with the exchange of an additional laser photon in the presence of the potential of the remaining target. Based on the asymptotic form of the wave packet, the latter term is expected to be negligible because the ion is neutralized, leading to a vanishing laser-ion interaction with increasing electron-atom separation. While this asymptotic behavior is verified at high photoelectron energies, we also quantify sharp deviations at low photoelectron energies. Further, these low-energy delays are clearly different for the two studied anions, indicating a breakdown of the universality of laser-ion-induced delays. The fact that the short-range potential can induce a delay of as much as 50 as can have implications for the interpretation of delay measurements also in other systems that lack long-range potential.},
  author       = {Lindroth, Eva and Dahlström, Jan Marcus},
  issn         = {2469-9926},
  language     = {eng},
  number       = {1},
  publisher    = {American Physical Society},
  series       = {Physical Review A},
  title        = {Attosecond delays in laser-assisted photodetachment from closed-shell negative ions},
  url          = {http://dx.doi.org/10.1103/PhysRevA.96.013420},
  doi          = {10.1103/PhysRevA.96.013420},
  volume       = {96},
  year         = {2017},
}