Ionization and Recombination with Electrons: Laboratory Measurements and Observational Consequences

Savin, D. W.

doi:10.1063/1.1960942

Cited by 3 publications

(4 citation statements)

References 28 publications

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“…Yet surprisingly the recommended rate coefficients are in poor agreement. Differences of up to a factor of 2-3 as has been noted by Kato et al [14] and Savin [15].…”

Section: Electron Impact Ionization (Eii)mentioning

confidence: 55%

Some Ionization and Recombination Data Needs for Cosmic Atomic Plasmas

Savin¹

2007

AIP Conference Proceedings

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Cosmic atomic plasmas can be divided into two broad classes: electron ionized and photoionized. Electron-ionized plasmas are formed in objects such as the sun and other stars, supernova remnants, galaxies, and the intercluster medium in clusters of galaxies. Photoionized plasmas are formed in objects such as planetary nebulae, H II regions, X-ray binaries, and active galactic nuclei. Understanding the spectral and thermal properties of these objects requires an accurate knowledge of the ionization level of the gas. This in turn depends on a reliable understanding of the underlying ionization and recombination processes which determine the ionization balance. Here we review some of the various atomic collision processes which determine the charge state distribution in a cosmic atomic plasma and briefly discuss some of the recent theoretical and experimental advances in generating the needed atomic data. We close by describing the relevant atomic data needs for the near future.

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“…Yet surprisingly the recommended rate coefficients are in poor agreement. Differences of up to a factor of 2-3 as has been noted by Kato et al [14] and Savin [15].…”

Section: Electron Impact Ionization (Eii)mentioning

confidence: 55%

Some Ionization and Recombination Data Needs for Cosmic Atomic Plasmas

Savin¹

2007

AIP Conference Proceedings

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“…Plasma recombination rate coefficients (PRRC) for HCIs in different charge states are the fundamental data needed in the plasma modeling codes. [39] In contrast to the very narrow velocity distribution for the electrons in a storage ring electron-ion recombination experiment, as shown in Eq. ( 8), the electrons in astrophysical and fusion plasmas characterize a much broader isotropic Maxwellian velocity spread.…”

Section: Plasma Recombination Rate Coefficientsmentioning

confidence: 91%

Absolute dielectronic recombination rate coefficients of highly charged ions at the storage ring CSRm and CSRe

Huang

Wang

et al. 2023

Chinese Phys. B

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Dielectronic recombination (DR) is one of the dominant electron-ion recombination mechanisms for most highly charged ions (HCIs) in cosmic plasmas, and thus, it determines the charge state distribution and ionization balance therein. To reliably interpret spectra from cosmic sources and model the astrophysical plasmas, precise DR rate coefficients are required to build up an accurate understanding of the ionization balance of the sources. The storage rings CSRm and CSRe at the Heavy-Ion Research Facility in Lanzhou (HIRFL) are both equipped with electron cooling devices, which provide an excellent experimental platform for electron-ion collision studies for HCIs. Here, the status of the DR experiments at the HIRFL-CSR is outlined, and the DR measurements with Na-like Kr25+ ions at the CSRm and CSRe are taken as examples. In addition, the plasma recombination rate coefficients for Ar12+, 14+, Ca14+, 16+, 17+, Ni19+, and Kr25+ ions obtained at the HIRFL-CSR are provided. All the data presented in this paper are openly available at https://www.scidb.cn/anonymous/UUpuSWZx.

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“…For electron-ion collision processes in astrophysical plasmas, dielectronic recombination (DR) is one of the important recombination process, which determines the charge state distribution and ionization balance therein. Therefore, precise DR rate coefficients are an issue of major concern for astrophysical plasma modeling [7][8][9][10]. In case of collisionally ionized plasma, theoretical DR data are now available in literature [3,11,12] with rather good agreement to the experimental data for plasma modeling [13].…”

Section: Introductionmentioning

confidence: 99%

“…These discrepancies were due to under estimation of low-temperature DR rate coefficient by available models for L-shell and M-shell iron ions. In order to solve this problem, electron-ion recombination experiments on different charge state of iron ions have been initiated at the test storage ring (TSR) [7,26], Heidelberg Germany. The purpose was to provide the accurate experimental DR data and reduce the uncertainties in calculations.…”

Section: Introductionmentioning

confidence: 99%

Low energy range dielectronic recombination of Fluorine-like Fe ¹⁷⁺ at the CSRm

et al. 2018

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The accuracy of dielectronic recombination (DR) data for astrophysics related ions plays a key role in astrophysical plasma modeling. The measurement of the absolute DR rate coefficient of Fe 17+ ions was performed at the main cooler storage ring at Institute of Modern Physics, Lanzhou, China. The experimental electron-ion collision energy range covers first Rydberg series up to n = 24 for the DR resonances associated with the 2 P1/2 → 2 P3/2 ∆n = 0 core excitations. A theoretical calculation was performed by using FAC code and compared with the measured DR rate coefficient. Overall reasonable agreement was found between the experimental results and calculations. Moreover, plasma rate coefficient was deduced from the experimental DR rate coefficient and compared with the available results from the literature. At the low energy range significant discrepancies were found therein and the measured resonances challenged state-of-the-art theory at the low collision energies.

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Ionization and Recombination with Electrons: Laboratory Measurements and Observational Consequences

Cited by 3 publications

References 28 publications

Some Ionization and Recombination Data Needs for Cosmic Atomic Plasmas

Some Ionization and Recombination Data Needs for Cosmic Atomic Plasmas

Absolute dielectronic recombination rate coefficients of highly charged ions at the storage ring CSRm and CSRe

Low energy range dielectronic recombination of Fluorine-like Fe ¹⁷⁺ at the CSRm

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Ionization and Recombination with Electrons: Laboratory Measurements and Observational Consequences

Cited by 3 publications

References 28 publications

Some Ionization and Recombination Data Needs for Cosmic Atomic Plasmas

Some Ionization and Recombination Data Needs for Cosmic Atomic Plasmas

Absolute dielectronic recombination rate coefficients of highly charged ions at the storage ring CSRm and CSRe

Low energy range dielectronic recombination of Fluorine-like Fe 17+ at the CSRm

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Low energy range dielectronic recombination of Fluorine-like Fe ¹⁷⁺ at the CSRm