Effects of initial-state population variations on the 2p. -->. 1s K. cap alpha. dielectronic satellite spectra of highly ionized iron ions in high-temperature astrophysical and laboratory plasmas

Journal Article · Wed Mar 01 00:00:00 EST 1989 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.39.2411· OSTI ID:6391061

Jacobs, V L; Doschek, G A; Seely, J F; Cowan, R D

Theoretical predictions are presented for the iron K..cap alpha.. x-ray emission spectra from high-temperature plasmas, assuming steady-state optically thin excitation conditions. Account has been taken of all fine-structure components of the 2p..-->..1s inner-shell-electron radiative transitions in the iron ions from Fe XVIII to Fe XXIV. The K..cap alpha.. emission spectra are assumed to be produced by means of dielectronic recombination and inner-shell-electron collisional excitation processes that involve intermediate autoionizing states belonging to electronic configurations of the type 1s/sup 1/2s/sup r/2p/sup s/. In addition to the electron-temperature variation, which is attributable to the temperature dependences of the radiationless electron capture and inner-shell-electron collisional excitation rate coefficients and to the temperature dependence of the charge-state distribution, the K..cap alpha.. emission spectra exhibit an electron-density sensitivity. This electron-density sensitivity is a result of the density-dependent distribution of populations among the different fine-structure levels of the initial ions in the dielec- tronic recombination and inner-shell electron collisional excitation processes.

• Research Organization: Condensed Matter and Radiation Sciences Division, Code 4603, Naval Research Laboratory, Washington, D.C. 20375-5000
• OSTI ID: 6391061
• Journal Information: Phys. Rev. A; (United States), Vol. 39:5
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
HOT PLASMA
X-RAY SPECTRA
IRON IONS
ELECTRONS
ENERGY LEVELS
RECOMBINATION
SOLAR FLARES
SUPERNOVAE
CHARGED PARTICLES
ELEMENTARY PARTICLES
ERUPTIVE VARIABLE STARS
FERMIONS
IONS
LEPTONS
PLASMA
SOLAR ACTIVITY
SPECTRA
STARS
VARIABLE STARS
700102* - Fusion Energy- Plasma Research- Diagnostics