3s--3p laser gain and x-ray line ratios for the carbon isoelectronic sequence

Journal Article · Sun Jun 15 04:00:00 EDT 1986 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.336695· OSTI ID:5715825

Feldman, U; Seely, J F; Doschek, G A; Bhatia, A K

The populations of the 46 levels belonging to the configurations 2s/sup 2/2p/sup 2/, 2s2p/sup 3/, 2p/sup 4/, 2s/sup 2/2p3s, 2s/sup 2/2p3p, and 2s/sup 2/2p3d have been calculated for ions in the C I isoelectronic sequence with atomic numbers Z = 18, 22, 26, 30, 34, and 36 and for electron densities from 10/sup 15/ to 10/sup 22/ cm/sup -3/. The populations of the 2s/sup 2/2p3p levels are relatively large owing to the large electron collisional monopole excitation rates from the ground configuration and to the small radiative decay rates to the ground configuration. This results in population inversions for transitions of the type 3s--3p. The gain coefficients for these transitions are determined and are compared to previous calculations. At high electron densities where collisional mixing of the excited levels becomes important, the intensities of the x-ray transitions from the 2s/sup 2/2p3p levels to the 2s2p/sup 3/ levels decrease relative to the x-ray transitions from the 2s/sup 2/2p3s and 2s/sup 2/2p3d levels. The density dependence of these x-ray line ratios is also presented. These line ratios represent a promising diagnostic for electron density.

• Research Organization: E. O. Hulburt Center for Space Research, Naval Research Laboratory, Washington, DC 20375--5000
• OSTI ID: 5715825
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 59:12; ISSN JAPIA
• Country of Publication: United States
• Language: English

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Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
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74 ATOMIC AND MOLECULAR PHYSICS
AMPLIFICATION
ARGON IONS
CHARGED PARTICLES
COLLISIONS
D STATES
ELECTRON COLLISIONS
ELECTRON DENSITY
ELECTRON-ION COLLISIONS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
GAIN
GROUND STATES
ION COLLISIONS
IONS
IRON IONS
KRYPTON IONS
P STATES
PLASMA DIAGNOSTICS
POPULATION INVERSION
S STATES
SELENIUM IONS
SPECTRA
SPECTROSCOPY
TITANIUM IONS
X-RAY SPECTRA
X-RAY SPECTROSCOPY
ZINC IONS