Valence-shell photoionization of the chlorinelike Ca<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>ion

Alna’Washi, G.; Lu, Mei-Ju; Habibi, M.; Phaneuf, R. A.; Kilcoyne, A. L. D.; Schlachter, A. S.; Cisneros, C.; McLaughlin, B. M.

doi:10.1103/physreva.81.053416

Cited by 19 publications

(14 citation statements)

References 26 publications

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“…Initial measurements of photoionization cross sections for O + ions [18] and C 2+ ions [20] using the IPB end station were reported in the literature. The ALS group has recently reported detailed experimental and theoretical studies on the Cl-like calcium (Ca 3+ ) ion [26] in addition to a variety of other singly and multiply charged ions, particularly of astrophysical interest, using this same IPB end station: He-like; Li + [27,28], Li-like; B 2+ [29], Be-like; C 2+ [30], B + [31], C 2+ , N 3+ , and O 4+ [22,32], B-like; C + [33], F-like; Ne + [10], N-like ions; O + [18], F 2+ and Ne 3+ [11]. These high-resolution experimental results enable theoretical studies to be benchmarked, so that the resulting data can be used with confidence in various astrophysical applications that utilize modeling codes such as CLOUDY [34,35] and XSTAR [36].…”

Section: Methodsmentioning

confidence: 99%

Valence-shell photoionization of chlorinelike Ar+ions

et al. 2011

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Absolute cross-section measurements for valence-shell photoionization of Ar + ions are reported for photon energies ranging from 27.4 to 60.0 eV. The data, taken by merging beams of ions and synchrotron radiation at a photon energy resolution of 10 meV, indicate that the primary ion beam was a statistically weighted mixture of the 2 P o 3/2 ground state and the 2 P o 1/2 metastable state of Ar + . Photoionization of this Cl-like ion is characterized by multiple Rydberg series of autoionizing resonances superimposed on a direct photoionization continuum. Observed resonance line shapes indicate interference between indirect and direct photoionization channels. Resonance features are spectroscopically assigned and their energies and quantum defects are tabulated. The measurements are satisfactorily reproduced by theoretical calculations based on an intermediate coupling semirelativistic Breit-Pauli approximation.

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Section: Methodsmentioning

confidence: 99%

Valence-shell photoionization of chlorinelike Ar+ions

et al. 2011

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“…A detailed description of the IPB apparatus was given by Covington et al [8], with recent modifications described by Alna'Washi et al [9]. Se ions were produced by placing pellets of solid Se within an all-permanent-magnet electron-cyclotron-resonance (ECR) ion source similar to that reported by Broetz et al [10] and Trassl et al [11].…”

Section: Methodsmentioning

confidence: 99%

Absolute high-resolution Se+photoionization cross-section measurements with Rydberg-series analysis

et al. 2011

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Absolute single photoionization cross-section measurements for Se + ions were performed at the Advanced Light Source (ALS) at Lawrence Berkeley National Laboratory using the photo-ion merged-beams technique. Measurements were made at a photon energy resolution of 5.5 meV from 17.75 to 21.85 eV spanning the 4s 2 4p 3 4 S o 3/2 ground-state ionization threshold and the 2 P o 3/2 , 2 P o 1/2 , 2 D o 5/2 , and 2 D o 3/2 metastable state thresholds. Extensive analysis of the complex resonant structure in this region identified numerous Rydberg series of resonances and obtained the Se 2+ 4s 2 4p 2 3 P 2 and 4s 2 4p 2 1 S 0 state energies. In addition, particular attention was given to removing significant effects in the measurements due to a small percentage of higher-order undulator radiation.

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“…The photoionization measurements were performed using the ion photon beam (IPB) end station on the ALS undulator beamline 10.0.1 [23,24]. A collimated and mass-selected beam of 136 Xe@C + 60 ions was electrostatically guided onto the axis of a counterpropagating beam of monochromatized synchrotron radiation.…”

Section: A Experimentsmentioning

confidence: 99%

Probing confinement resonances by photoionizing Xe inside a C60+molecular cage

et al. 2013

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Double photoionization accompanied by loss of n C atoms (n = 0, 2, 4, 6) was investigated by merging beams of Xe@C + 60 ions and synchrotron radiation and measuring the yields of product ions. The giant 4d dipole resonance of the caged Xe atom has a prominent signature in the cross section for these product channels, which together account for 6.2 ± 1.4 of the total Xe 4d oscillator strength of 10. Compared to that for a free Xe atom, the oscillator strength is redistributed in photon energy due to multipath interference of outgoing Xe 4d photoelectron waves that may be transmitted or reflected by the spherical C + 60 molecular cage, yielding so-called confinement resonances. The data are compared with an earlier measurement and with theoretical predictions for this single-molecule photoelectron interferometer system. Relativistic R-matrix calculations for the Xe atom in a spherical potential shell representing the fullerene cage show the sensitivity of the interference pattern to the molecular geometry.

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Valence-shell photoionization of the chlorinelike Ca3+ion

Cited by 19 publications

References 26 publications

Valence-shell photoionization of chlorinelike Ar+ions

Valence-shell photoionization of chlorinelike Ar+ions

Absolute high-resolution Se+photoionization cross-section measurements with Rydberg-series analysis

Probing confinement resonances by photoionizing Xe inside a C60+molecular cage

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