| 1. |
- Aguilar, A., et al.
(author)
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Double photodetachment from the Cl[-]ion
- 2004
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In: Physical Review A - Atomic, Molecular, and Optical Physics. - 2469-9926 .- 2469-9934. ; 69:2
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Journal article (peer-reviewed)abstract
- The correlated process involving the photodetachment of two electrons from the [Formula Presented] ion has been investigated over the photon energy range 20–45 eV. In the experiment, a beam of photons from the Advanced Light Source (ALS) was collinearly merged with a counterpropagating beam of [Formula Presented] ions from a sputter ion source. The [Formula Presented] ions produced in the interaction region were detected, and the normalized signal was used to monitor the relative cross section for the reaction. An absolute scale for the cross section was established by measuring the spatial overlap of the two beams and by determining the efficiency for collection and detection of the [Formula Presented] ions. The overall magnitude and shape of the measured cross section for this process agrees well with an R-matrix calculation. The calculation identifies the dominant mechanism leading to the production of the [Formula Presented] ion as being a direct nonresonant process involving the ejection of a pair of electrons from the valence shell. Less important is the indirect nonresonant process that involves the production and decay of core-excited and doubly excited states of the Cl atom in an intermediate step. Direct and indirect resonant mechanisms involving the excitation of a single [Formula Presented] core electron or more than one valence electron of the [Formula Presented] ion were found to be insignificant in the energy range studied.
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| 2. |
- Fritioff, K, et al.
(author)
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Single and double detachment from H-
- 2004
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In: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947 .- 1094-1622 .- 2469-9926 .- 2469-9934. ; 69:4, s. 042707-
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Journal article (peer-reviewed)abstract
- Absolute cross sections for single and double detachment from H- following electron impact have been measured over a range of collision energies from the thresholds to 170 eV. The measurements were made using a magnetic storage ring. The ions in the ring were merged with a monoenergetic electron beam and neutral and positively charged fragments were detected. We cover larger energy ranges than in many of the previous experiments, and this is the first time both single and double detachment have been measured simultaneously. This allows us to present accurate ratios between the single and double detachment cross sections. On the basis of these ratio measurements we discuss possible mechanisms leading to double detachment.
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| 3. |
- Larsson, Jan-Åke, 1969-
(author)
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No information flow using statistical fluctuations and quantum cryptography
- 2004
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In: Physical Review A: covering atomic, molecular, and optical physics and quantum information. - : American Physical Society. - 2469-9926 .- 2469-9934. ; 69:4, s. 042317-1-042317-8
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Journal article (peer-reviewed)abstract
- The use of entanglement by quantum-cryptographic protocol to transfer the data was discussed. The detection of individual eavesdropping attack on each qubit was detected by the security test where the qubits provides the key, and there exists a coherent attack internal to these groups, which goes unnoticed in security tests. The result shows that the level of the individual qubits also detect the coherent attack by testing equality for the measurements. A modified test was proposed to ensure security against a coherent attack.
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| 4. |
- Przewoski, Barbara, et al.
(author)
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Spin Exchange in Polarized Deuterium
- 2003
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In: Physical Review A: covering atomic, molecular, and optical physics and quantum information. - : American Physical Society. - 2469-9926 .- 2469-9934. ; 68:042705, s. 4-
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Journal article (peer-reviewed)abstract
- We have measured the vector and tensor polarization of an atomic deuterium targte as a function of the target density. Th epolarized deuterium was produced in an atomic beam source and injected into a storage cell. For this experiment, the atomic beam sou
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