Multiple ionization and x-ray line emission resulting from inner-shell electron ionization

Jacobs, V. L.; Rozsnyai, Balazs F.

doi:10.1103/physreva.34.216

Cited by 40 publications

(28 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With the exception of the values by Kaastra & Mewe (1993), theory predicts a decrease of the ratio with N, and the theoretical scatter is comparable with that among the solid-state experiments of just under 20%. The computed results by , - and Jacobs & Rozsnyai (1986) for N = 25 are in good agreement with the bulk of the experimental values (Perujo et al 1987;Rao et al 1986;Berényi et al 1978;Salem et al 1972;Slivinsky & Ebert 1972;Hansen et al 1970). Hölzer et al (1997) mention a possible systematic deviation in one of their corrections to explain the discrepancy of their data with other measurements.…”

Section: Resultssupporting

confidence: 83%

“…Kaastra & Mewe (1993) have been corrected so as to reproduce the best solid-state yields compiled in Bambynek et al (1972) and are therefore somewhat lower than our values. Results by Jacobs & Rozsnyai (1986) for N > 12 predict a substantially lower yield. In order to evaluate the impact of the new atomic data on Fe K-line modeling, the data sets generated in the present work and those in Papers I-III have been included in the  modeling code (Kallman & Bautista 2001).…”

Section: Resultsmentioning

confidence: 92%

“…by averaging on all the K-vacancy levels, Paper III. Circles: Jacobs & Rozsnyai (1986). Squares: Kaastra & Mewe (1993).…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Modeling of iron K lines: Radiative and Auger decay data for $\ion{Fe}{ii}$–$\ion{Fe}{ix}$

Palmeri

Mendoza

Kallman

et al. 2003

A&A

139

127

View full text Add to dashboard Cite

Abstract.A detailed analysis of the radiative and Auger de-excitation channels of K-shell vacancy states in Fe -Fe  has been carried out. Level energies, wavelengths, A-values, Auger rates and fluorescence yields have been calculated for the lowest fine-structure levels populated by photoionization of the ground state of the parent ion. Different branching ratios, namely Kα 2 /Kα 1 , Kβ/Kα, KLM/KLL, KMM/KLL, and the total K-shell fluorescence yields, ω K , obtained in the present work have been compared with other theoretical data and solid-state measurements, finding good general agreement with the latter. The Kα 2 /Kα 1 ratio is found to be sensitive to the excitation mechanism. From these comparisons it has been possible to estimate an accuracy of ∼10% for the present transition probabilities.

show abstract

Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 92%

See 1 more Smart Citation

Modeling of iron K lines: Radiative and Auger decay data for $\ion{Fe}{ii}$–$\ion{Fe}{ix}$

Palmeri

Mendoza

Kallman

et al. 2003

A&A

139

127

View full text Add to dashboard Cite

show abstract

“…Scofield 1974) for FeI-FeIX and it is decreasing for higher iron ionization stages (e.g. Jakobs & Rozsnyai 1986). The ratio is an increasing function of the atomic number Z.…”

Section: K-shell Ionization and X-ray Line Emissivitymentioning

confidence: 99%

X-ray line emission from supernova ejecta fragments

Bykov

2002

A&A

View full text Add to dashboard Cite

Abstract. We show that fast moving isolated fragments of a supernova ejecta composed of heavy elements should be sources of K α X-ray line emission of the SN nuclear-processed products. Supersonic motion of the knots in the intercloud medium will result in a bow-shock/knot-shock structure creation. Fast nonthermal particles accelerated by Fermi mechanism in the MHD collisionless shocks diffuse through a cold metallic knot, suffering from Coulomb losses and producing the X-ray emission. We modeled the X-ray emission from a fast moving knot of mass M ∼ 10 −3 M , containing about ∼10 −4 M of any metal impurities like Si, S, Ar, Ca, Fe. The accelerated electron distribution was simulated using the kinetic description of charged particles interacting with a strong MHD shock. We accounted for nonlinear effects of shock modification by the nonthermal particle pressure. The K α line emission is most prominent for the knots propagating through dense molecular clouds. The bow shock should be a radiative wave with a prominent infrared and optical emission. In that case the X-ray line spectrum of an ejecta fragment is dominated by the low ionization states of the ions with the metal line luminosities reaching L x > ∼ 10 31 erg s −1 . High resolution XMM-Newton and Chandra observations are able to detect the K α and K β line emission from the knots at distances up to a few kpcs. The knots propagating through tenuous interstellar matter are of much fainter surface brightness but long-lived. The line spectra with higher ionization states of the ions are expected in that case. Compact dense knots could be opaque for some X-ray lines and that is important for their abundances interpretation. The ensemble of unresolved knots of galactic supernovae can contribute substantially to the iron line emission observed from the Galactic Center region and the Galactic ridge.

show abstract

“…Additional indirect mechanisms, such as double autoionization following radiationless electron capture, have been investigated and have been found to be important in special cases. For sufficiently deep inner-shell-electron vacancies in heavy atoms, the cascade decay process involving a sequence of radiative, Auger, and Coster Kronig transitions can result in a state of multiple ionization [35].…”

Section: Charge-state Distributionsmentioning

confidence: 99%

Kα X-ray emission spectra from highly charged Fe ions in EBIT

Jacobs¹,

Beiersdörfer²

2008

Can. J. Phys.

View full text Add to dashboard Cite

A detailed spectral model has been developed for the computer simulation of the 2p→1s Kα X-ray emission from highly charged Fe ions in the Electron Beam Ion Trap (EBIT). The spectral features of interest occur in the range from 1.84 Å to 1.94 Å. The fundamental radiative emission processes associated with radiationless electron capture or dielectronic recombination, inner-shell electron collisional excitation, and inner-shell electron collisional ionization are taken in account. For comparison, spectral observations and simulations for high-temperature magnetic-fusion (Tokamak) plasmas are reviewed.In these plasmas, small departures from steady-state corona-model charge-state distributions can occur due to ion transport processes, while the assumption of equilibrium (Maxwellian) electron energy distributions is expected to be valid. Our investigations for EBIT have been directed at the identification of spectral features that can serve as diagnostics of extreme non-equilibrium or transient-ionization conditions, and allowance has been made for general (non-Maxwellian) electron energy distributions. For the precise interpretation of the high-resolution X-ray observations, which may involve the analysis of blended spectral features composed of many lines, it has been necessary to take into account the multitude of individual fine-structure components of the Kα radiative transitions in the ions from Fe XVIII to Fe XXV. At electron densities higher than the validity range of the corona-model approximation, collisionally induced transitions among low-lying excited states can play an important role. It is found that inner-shell electron excitation and ionization processes involving the complex intermediate

show abstract

Multiple ionization and x-ray line emission resulting from inner-shell electron ionization

Cited by 40 publications

References 16 publications

Modeling of iron K lines: Radiative and Auger decay data for $\ion{Fe}{ii}$–$\ion{Fe}{ix}$

Modeling of iron K lines: Radiative and Auger decay data for $\ion{Fe}{ii}$–$\ion{Fe}{ix}$

X-ray line emission from supernova ejecta fragments

Kα X-ray emission spectra from highly charged Fe ions in EBIT

Contact Info

Product

Resources

About