Electron-ion recombination for Fe VIII forming Fe VII and Fe IX forming Fe VIII: measurements and theory

E. W. Schmidt, S. Schippers, D. Bernhardt, A. Müller, J. Hoffmann, M. Lestinsky, D. A. Orlov, A. Wolf, D. V. Lukic, D. W. Savin, N. R. Badnell

Research output: Contribution to journalArticle

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Abstract

The photorecombination rate coefficients of potassium-like Fe VIII ions forming calcium-like Fe VII and of argon-like Fe IX forming potassium-like Fe VIII were measured by employing the merged electron-ion beams method at the Heidelberg heavy-ion storagering TSR. New theoretical calculations with the AUTOSTRUCTURE code were carried out for dielectronic recombination (DR) and trielectronic recombination (TR) for both ions. We compare these experimental and theoretical results and also compare with previously recommended rate coefficients. The DR and TR resonances were experimentally investigated in the electron-ion collision energy ranges 0-120 eV and 0-151 eV for Fe VIII and Fe IX. Experimentally derived Fe VIII and Fe IX DR + TR plasma rate coefficients are provided in the temperature range k(B)T = 0.2 to 1000 eV. Their uncertainties amount to < +/- 26% and < +/- 35% at a 90% confidence level for Fe VIII and Fe IX, respectively.

LanguageEnglish
Pages265-275
Number of pages11
JournalAstronomy and Astrophysics
Volume492
Issue number1
DOIs
Publication statusPublished - 2 Dec 2008

Fingerprint

electron-ion recombination
recombination
electron
ion
potassium
coefficients
ions
calcium
confidence
heavy ions
ion beams
argon
electron beams
collisions
electrons
collision
plasma
temperature
energy
rate

Keywords

  • atomic data
  • atomic processes
  • plasmas
  • galaxies: active
  • galaxies: nuclei
  • X-rays: galaxies
  • active galactic nuclei
  • x-ray absorption
  • high-resolution measurement
  • finite-density plasmas
  • dielectronic recombination
  • rate coefficients
  • ionized-gas
  • xmm-newton
  • theoretical calculations
  • laboratory measurements

Cite this

Schmidt, E. W. ; Schippers, S. ; Bernhardt, D. ; Müller, A. ; Hoffmann, J. ; Lestinsky, M. ; Orlov, D. A. ; Wolf, A. ; Lukic, D. V. ; Savin, D. W. ; Badnell, N. R. / Electron-ion recombination for Fe VIII forming Fe VII and Fe IX forming Fe VIII : measurements and theory. In: Astronomy and Astrophysics. 2008 ; Vol. 492, No. 1. pp. 265-275.
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Schmidt, EW, Schippers, S, Bernhardt, D, Müller, A, Hoffmann, J, Lestinsky, M, Orlov, DA, Wolf, A, Lukic, DV, Savin, DW & Badnell, NR 2008, 'Electron-ion recombination for Fe VIII forming Fe VII and Fe IX forming Fe VIII: measurements and theory' Astronomy and Astrophysics, vol. 492, no. 1, pp. 265-275. https://doi.org/10.1051/0004-6361:200810834

Electron-ion recombination for Fe VIII forming Fe VII and Fe IX forming Fe VIII : measurements and theory. / Schmidt, E. W.; Schippers, S.; Bernhardt, D.; Müller, A.; Hoffmann, J.; Lestinsky, M.; Orlov, D. A.; Wolf, A.; Lukic, D. V.; Savin, D. W.; Badnell, N. R.

In: Astronomy and Astrophysics, Vol. 492, No. 1, 02.12.2008, p. 265-275.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Electron-ion recombination for Fe VIII forming Fe VII and Fe IX forming Fe VIII

T2 - Astronomy and Astrophysics

AU - Schmidt, E. W.

AU - Schippers, S.

AU - Bernhardt, D.

AU - Müller, A.

AU - Hoffmann, J.

AU - Lestinsky, M.

AU - Orlov, D. A.

AU - Wolf, A.

AU - Lukic, D. V.

AU - Savin, D. W.

AU - Badnell, N. R.

PY - 2008/12/2

Y1 - 2008/12/2

N2 - The photorecombination rate coefficients of potassium-like Fe VIII ions forming calcium-like Fe VII and of argon-like Fe IX forming potassium-like Fe VIII were measured by employing the merged electron-ion beams method at the Heidelberg heavy-ion storagering TSR. New theoretical calculations with the AUTOSTRUCTURE code were carried out for dielectronic recombination (DR) and trielectronic recombination (TR) for both ions. We compare these experimental and theoretical results and also compare with previously recommended rate coefficients. The DR and TR resonances were experimentally investigated in the electron-ion collision energy ranges 0-120 eV and 0-151 eV for Fe VIII and Fe IX. Experimentally derived Fe VIII and Fe IX DR + TR plasma rate coefficients are provided in the temperature range k(B)T = 0.2 to 1000 eV. Their uncertainties amount to < +/- 26% and < +/- 35% at a 90% confidence level for Fe VIII and Fe IX, respectively.

AB - The photorecombination rate coefficients of potassium-like Fe VIII ions forming calcium-like Fe VII and of argon-like Fe IX forming potassium-like Fe VIII were measured by employing the merged electron-ion beams method at the Heidelberg heavy-ion storagering TSR. New theoretical calculations with the AUTOSTRUCTURE code were carried out for dielectronic recombination (DR) and trielectronic recombination (TR) for both ions. We compare these experimental and theoretical results and also compare with previously recommended rate coefficients. The DR and TR resonances were experimentally investigated in the electron-ion collision energy ranges 0-120 eV and 0-151 eV for Fe VIII and Fe IX. Experimentally derived Fe VIII and Fe IX DR + TR plasma rate coefficients are provided in the temperature range k(B)T = 0.2 to 1000 eV. Their uncertainties amount to < +/- 26% and < +/- 35% at a 90% confidence level for Fe VIII and Fe IX, respectively.

KW - atomic data

KW - atomic processes

KW - plasmas

KW - galaxies: active

KW - galaxies: nuclei

KW - X-rays: galaxies

KW - active galactic nuclei

KW - x-ray absorption

KW - high-resolution measurement

KW - finite-density plasmas

KW - dielectronic recombination

KW - rate coefficients

KW - ionized-gas

KW - xmm-newton

KW - theoretical calculations

KW - laboratory measurements

U2 - 10.1051/0004-6361:200810834

DO - 10.1051/0004-6361:200810834

M3 - Article

VL - 492

SP - 265

EP - 275

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

IS - 1

ER -