Electron-impact ionization of neon ions (<b><i>q</i></b>= 4 - 8)

Duponchelle, M.; Khouilid, M.; Oualim, El Mostafa; Zhang, H.; Defrance, Pierre

doi:10.1088/0953-4075/30/3/025

Cited by 48 publications

(58 citation statements)

References 28 publications

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“…The measurements of Bannister for Ne vii are consistent with the Duponchelle et al (1997) ones at high energies, but show a bump around 280 eV, and are finally rejected. For S xiii, Hahn et al (2012a) eliminated all metastable levels using hyperfine induced decays, combined with an ion storage ring, obtaining a total cross-section with 1σ uncertainty of 15%.…”

Section: Di: 2s Cross-sectionsmentioning

confidence: 56%

“…Since the data range for Ne ix, as measured by Duponchelle et al (1997), is rather limited, we have supplemented their data by adding the cross-sections at u = 100, as interpolated from the calculations of Zhang & Sampson (1990) for O vii and Fe xxv.…”

Section: He Isoelectronic Sequencementioning

confidence: 99%

“…The elements of the B-like sequence (1s 2 2s 2 2p) have an EA contribution in the outer shell that is relatively small (Yamada et al 1989a;Duponchelle et al 1997;Loch et al 2003).…”

Section: The B Isoelectronic Sequencementioning

confidence: 99%

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X-ray emission from thin plasmas

Urdampilleta

Kaastra

Mehdipour

2017

A&A

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Every observation of astrophysical objects involving a spectrum requires atomic data for the interpretation of line fluxes, line ratios, and ionization state of the emitting plasma. One of the processes that determines it is collisional ionization. In this study, an update of the direct ionization (DI) and excitation-autoionization (EA) processes is discussed for the H to Zn-like isoelectronic sequences. In recent years, new laboratory measurements and theoretical calculations of ionization cross-sections have become available. We provide an extension and update of previous published reviews in the literature. We include the most recent experimental measurements and fit the cross-sections of all individual shells of all ions from H to Zn. These data are described using an extension of Younger's and Mewe's formula, suitable for integration over a Maxwellian velocity distribution to derive the subshell ionization rate coefficients. These ionization rate coefficients are incorporated in the high-resolution plasma code and spectral fitting tool SPEX V3.0.

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Section: Di: 2s Cross-sectionsmentioning

confidence: 56%

Section: He Isoelectronic Sequencementioning

confidence: 99%

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X-ray emission from thin plasmas

Urdampilleta

Kaastra

Mehdipour

2017

A&A

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“…For Ne 2 , Ne 3 , Ne 4 , where e; 3e cross sections are not known, we scaled available e; 3e cross section data from isoelectronic species [27,28] using Ne fE=V IP;iso V IP;iso =V IP;Ne 2 , where Ne is the scaled cross section for Ne with a threshold of V IP;Ne and fE=V IP;iso is the cross section of an isoelectronic ion with its energy dependence E scaled to its threshold V IP;iso [29,30]. Because scaled isoelectronic e; 3e cross sections are within 25% of the measured cross sections for Ne , Ne 5 , and Ne 6 we believe the scaled Ne 2 , Ne 3 , and Ne 4 cross sections have a similar accuracy [31][32][33][34]. Representative error bars are shown in Fig.…”

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confidence: 99%

Ultrastrong Field Ionization ofNen+(n≤8): Rescattering and the Role of the Magnetic Field

et al. 2005

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Ne to Ne 8 ionization yields in 10 14 W=cm 2 to 10 18 W=cm 2 laser fields are reported over a 10 9 dynamic range. A 3D relativistic rescattering model incorporating e; 2e and e; 3e electron impact ionization, single-and double-excitation is compared to the data. For double ionization the agreement is excellent; however, for higher charge states the model accounts for only 15% of multielectron nonsequential ionization. Rescattering is not affected by the laser magnetic field until 10 17 W=cm 2 .Atomic ionization and radiation processes in strong fields have remained at the forefront of time resolved dynamics and laser science for the past 15 years. Recent interest has focused on quantum [1] and classical mechanisms [2] behind multielectron, multiphoton ionization and the new area of attosecond science [3,4]. These studies, which often address multielectron nonsequential ionization (NSI) [5] and high harmonic generation (HHG) [6], involve a field driven rescattering mechanism. As the field increases, higher charge states, relativistic effects, and the laser magnetic field (B laser ) will affect NSI, HHG, and rescattering physics. This Letter begins to address these topics with a precision, ultrahigh field ionization experiment and relativistic, semiclassical ionization and rescattering model. Rescattering [7] occurs when a photoelectron, which is oscillating in the continuum with the laser electric field (E laser ), is driven back toward the parent ion. For laser intensities from 10 13 W=cm 2 to 10 15 W=cm 2 , inelastic rescattering between the photoelectron and the parent ion may result in collisional ionization (NSI) or radiation (HHG). Two-electron NSI has been observed [8] to exceed by 10 5 the expected doubly ionized species from a sequential ionization (SI) mechanism, in which the laser field ionizes the atom one electron at a time. Recent theoretical [9-12] and experimental efforts have made significant progress towards understanding two-electron NSI mechanisms including resonantly enhanced multiphoton ionization [13,14] and rescattering impact excitation and ionization [15].Beyond two-electron NSI of the neutral atom, multielectron NSI has been reported [16] but is not well understood at this time. Fully differential rates for the multiphoton ionization of ground state Ne [17], correlated electron emission measurements for multiphoton double ionization [18], and ion momentum measurements [19] indicate rescattering is likely to become a dominant NSI mechanism in ultrahigh fields with high charge states. Chowdhury [20] and Dammasch [21] measured multielectron ionization from 10 15 W=cm 2 to >10 17 W=cm 2 and found NSI decreased at higher intensities. Diminished NSI was at first believed to result from a reduction in rescattering due to the Lorentz force on the photoelectron. In the ''Lorentz force paradigm,'' B laser and the significant photoelectron velocity force the rescattering into the laser propagation direction (k v B) and away from the parent ion. As we will show, B laser does not play as large of a ...

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“…The values of the parameters in formula (2.4) have been obtained for the species, from the available experimental data using the least-squares method. ; Gregory et al [18], Donets and Ovsyannikov [13] for Ne 3+ , Bannister [17], Duponchelle et al [19] for Ne 4+ , Donets and Ovsyannikov [13], Bannister [16] and Duponchelle et al [19] for Ne 5+ , Donets and Ovsyannikov [13], Bannister [17] and Duponchelle et al [19] for Ne 6+ , Donets and Ovsyannikov [13], Defrance et al [20] and Duponchelle et al [19] for Ne 7+ , Donets and Ovsyannikov [13] and Duponchelle et al [19] for Ne 8+ , Donets and Ovsyannikov [13] for Ne 9+ .…”

Section: Resultsmentioning

confidence: 99%