Absolute measurements and calculations of dielectronic recombination with metastable He-like N, F, and Si ions

Lh, Andersen; Pan, Gy; Schmidt, H. T.; Nr, Badnell; Ms, Pindzola

doi:10.1103/physreva.45.7868

Cited by 24 publications

(10 citation statements)

References 21 publications

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“…There is good agreement between all three sets of results, with the R-matrix results perhaps in marginally better agreement with the observed. Measurements and calculations (using autostructure) for metastable N, F and Si were made by Andersen et al (1992) and the two were in good agreement, although the uncertainties were large for Si. There was a low energy resolution measurement of DR from the ground and metastable states of Li + by Závodszky et al (1998) and a higher energy resolution measurement, but still with a relatively weak signal, by Saghiri et al (1999), both were in broad accord with theory (Price 1997).…”

Section: Comparisons With Experimentsmentioning

confidence: 87%

Dielectronic recombination data for dynamic finite-density plasmas

Bautista¹,

Badnell

2007

A&A

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We report on total and final-state resolved partial dielectronic recombination data for helium-like ions forming lithium-like ions. The calculations consider ions of Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Zn, Kr, Mo, and Xe. The results are discussed and compared with available experimental data and with previous calculations. Our archived datasets include both total and level-specific DR rate coefficients. The total ion rate coefficients are provided both in tabulated form and as analytical fits for easy implementation into spectral modelling codes. We employ the level specific rate coefficients in constructing detailed spectral models of Li-like ions including the combined effects of collisional excitation and recombination. The results from these models are compared with the those pure collisional excitation models under typical conditions of low density plasmas. This work is part of an assembly of a dielectronic recombination database for modelling of finite-density plasmas.

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Section: Comparisons With Experimentsmentioning

confidence: 87%

Dielectronic recombination data for dynamic finite-density plasmas

Bautista¹,

Badnell

2007

A&A

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“…Indeed, few-electron ionic beams are typically delivered in the ground state and additional long-lived, metastable components. This is a general feature not only encountered in TANDEM accelerators [51,52], but also in storage rings [53,54], as well as other lower energy highly charged ion sources [35], even though the production mechanisms can be quite different depending on the type of ion source. Clearly, a desirable feature would be to have a variable and controllable amount of metastable beam.…”

Section: Production Of Metastable Statesmentioning

confidence: 95%

Mixed-State Ionic Beams: An Effective Tool for Collision Dynamics Investigations

Benis¹,

Madesis²,

Laoutaris³

et al. 2018

Preprint

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The use of mixed-state ionic beams in collision dynamics investigations is examined. Using high resolution Auger projectile spectroscopy involving He-like ($1s^2\thinspace^1\!S, 1s2s\thinspace^{3,1}\!S$) mixed-state beams, the spectrum contributions of the $1s2s\thinspace^3\!S$ metastable beam component is effectively separated and clearly identified. This is performed with a technique that exploits two independent spectrum measurements under the same collision conditions, but with ions having quite different metastable fractions, judiciously selected by varying the ion beam charge-stripping conditions. Details of the technique are presented together with characteristic examples. In collisions of 4 MeV B$^{3+}$ with H$_2$ targets, the Auger electron spectrum of the separated $1s2s\thinspace^{3}S$ boron beam component allows for a detailed analysis of the formation of the $1s2s(^3\!S)nl \thinspace^2\!L$ states by direct $nl$ transfer. In addition, the production of hollow $2s2p\thinspace^{1,3}\!P$ doubly- and $2s2p^2\thinspace^2\!D$ triply-excited states, by direct excitation and transfer-excitation processes, respectively, can also be independently studied. In similar mixed-state beam collisions of 15 MeV C$^{4+}$ with H$_2$, He, Ne and Ar targets, the contributions of the $1s^2$, $1s2s\thinspace^{3,1}S$ beam components to the formation of the $2s2p\thinspace^{3,1}\!P$ states by double-excitation, $1s\rightarrow2p$ excitation and transfer-loss processes can be clearly identified, facilitating comparisons with theoretical calculations.

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“…Indeed, few-electron ionic beams are typically delivered in the ground state and additional long-lived, metastable components. This is a general feature not only encountered in TANDEM accelerators [53,54], but also in storage rings [55,56], as well as other lower energy highly charged ion sources [37], even though the production mechanisms can be quite different depending on the type of ion source. Clearly, a desirable feature would be to have a variable and controllable amount of metastable beam.…”

Section: Production Of Metastable Statesmentioning

confidence: 95%

Mixed-State Ionic Beams: An Effective Tool for Collision Dynamics Investigations

Benis

Madesis

Laoutaris

et al. 2018

Atoms

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The use of mixed-state ionic beams in collision dynamics investigations is examined. Using high resolution Auger projectile spectroscopy involving He-like ( 1 s 2 1 S , 1 s 2 s 3 , 1 S ) mixed-state beams, the spectrum contributions of the 1 s 2 s 3 S metastable beam component is effectively separated and clearly identified. This is performed with a technique that exploits two independent spectrum measurements under the same collision conditions, but with ions having quite different metastable fractions, judiciously selected by varying the ion beam charge-stripping conditions. Details of the technique are presented together with characteristic examples. In collisions of 4 MeV B 3 + with H 2 targets, the Auger electron spectrum of the separated 1 s 2 s 3 S boron beam component allows for a detailed analysis of the formation of the 1 s 2 s ( 3 S ) n l 2 L states by direct n l transfer. In addition, the production of hollow 2 s 2 p 1 , 3 P doubly- and 2 s 2 p 2 2 D triply-excited states, by direct excitation and transfer-excitation processes, respectively, can also be independently studied. In similar mixed-state beam collisions of 15 MeV C 4 + with H 2 , He, Ne and Ar targets, the contributions of the 1 s 2 , 1 s 2 s 3 , 1 S beam components to the formation of the 2 s 2 p 3 , 1 P states by double-excitation, 1 s → 2 p excitation and transfer-loss processes can be clearly identified, facilitating comparisons with theoretical calculations.

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Absolute measurements and calculations of dielectronic recombination with metastable He-like N, F, and Si ions

Cited by 24 publications

References 21 publications

Dielectronic recombination data for dynamic finite-density plasmas

Dielectronic recombination data for dynamic finite-density plasmas

Mixed-State Ionic Beams: An Effective Tool for Collision Dynamics Investigations

Mixed-State Ionic Beams: An Effective Tool for Collision Dynamics Investigations

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