Polarized light emission in keV He<sup>2+</sup>+Na(3s) collisions

Schippers, S.; Boduch, P.; Buchem, J van; Bliek, F.W.; Hoekstra, Ronnie; Morgenstern, R.; Olson, R. E.

doi:10.1088/0953-4075/28/15/017

Cited by 38 publications

(32 citation statements)

References 21 publications

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“…In order to obtain emission cross sections, cascade contributions from higher n" > n levels are added, and the n, /, mi populations are multiplied by hydrogenic branching ratios for the relevant transitions and by their relative line strengths [32].…”

Section: Theoretical Methodsmentioning

confidence: 99%

Classical description ofH(1s)andH*(n=2)for cross-section calculations relev

2015

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In this work, we introduce a classical trajectory Monte Carlo (CTMC) methodology, specially conceived to provide a more accurate representation of charge-exchange processes between highly charged ions and H(U ) and H*(n = 2). These processes are of particular relevance in power fusion reactor programs, for which chargeexchange spectroscopy has become a useful plasma diagnostics tool. To test the methodology, electron-capture reactions from these targets by C6+, N7+, and 0 8+ are studied at impact energies in the 10-150 keV/amu range. State-selective cross sections are contrasted with those predicted by the standard microcanonical formulation of the CTMC method, the CTMC method with an energy variation of initial binding energies that produces an improved radial electron density, and the atomic orbital close-coupling method. The present results are found in to be much better agreement with the quantum-mechanical results than the results of former formulations of the CTMC method.

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Section: Theoretical Methodsmentioning

confidence: 99%

Classical description ofH(1s)andH*(n=2)for cross-section calculations relev

2015

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“…This allows one to probe the collision dynamics on a more fundamental level. Numerous experiments have been devoted in the past [1][2][3][4][5][6][7][8] to the determination of photon polarization degree in collisions of multicharged ions with atomic and molecular targets. In the keV energy region, most of the experiments have measured the polarization of emitted radiation following the single-electron capture in collisions of highly charged ions with alkali-metal atoms [4][5][6], and polarization degrees of 15∼40% have been observed.…”

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confidence: 99%

“…On the theoretical side, the classical trajectory Monte Carlo (CTMC) method has been widely used to calculate the polarization degree of emitted radiation from excited states created in charge transfer processes of fully and partially stripped ions with alkali-metal atoms [2,9]. Although the agreement between experimental measurements and theoretical calculations in most cases was found good, obtaining the magnetic state-selective cross sections from the fully classical distributions is an art.…”

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confidence: 99%

Polarization degree differences for the3p 2P3/2–3s 2
Liu
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,
Zhao
²
,
Wang
³

et al. 2010
Phys. Rev. A
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The magnetic substate-selective single-electron-capture cross sections in collisions of N 5+ with He and H 2 are calculated using the two-center atomic orbital close-coupling method, and the polarization of emitted radiation from the excited state of N 4+ is investigated for projectile energies between 1.2 and 7 keV/u. The polarization degrees for the 3p 2 P 3/2 -3s 2 S 1/2 transition of N 4+ (3p 2 P 3/2 ) produced in N 5+ + He and N 5+ + H 2 electroncapture collisions are in general agreement with the experimental measurements. It is found both experimentally and theoretically that there exists a large difference between the polarization degrees of this radiation resulting from the N 5+ + He and N 5+ + H 2 electron-capture collisions, namely, ∼0.25 and ∼0, respectively. By studying the time evolution of electron-capture dynamics in the two systems we have found that this difference is caused mainly by the difference in the interactions in the two systems at relatively small internuclear distances, consistent with the molecular picture of the collision dynamics.

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“…For almost 20 years, the CTMC line emission cross sections for the H target have been used for diagnostics on tokamak fusion plasmas to determine the concentrations of highly charged impurity ions in the energy range of 1 keV/amu to 40 keV/amu [9,10]. More recently, CTMC emission lines have been presented for collisions involving partially and fully stripped ions with Li, providing an accurate description of the measured data [11].…”

Section: Introductionmentioning

confidence: 99%