Effect of resonance excitation due to dielectronic capture on the gain coefficients of selected transitions in Fe XVII

Journal Article · Sun Dec 01 00:00:00 EST 1985 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.335573· OSTI ID:6401811

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

In previous papers, U. Feldman, J. F. Seely, and A. K. Bhatia (J. Appl. Phys. 56, 2475 (1984)) and A. K. Bhatia, U. Feldman, and J. F. Seely (At. Data Nucl. Data Tables (in press)) have calculated atomic data and gain coefficients for ions of the Ne I isoelectronic sequence. Their calculations of electron impact excitation rates were carried out in the distorted wave approximation. They did not include the effect of resonance excitation, i.e., dielectronic capture by a Ne-like ion followed by autoionization leaving the Ne-like ion in an excited state. In this paper, we use the recent calculations of this process by B. W. Smith, J. C. Raymond, J. B. Mann, and R. D. Cowan (Astrophys. J. (in press)) to explore the effect of resonance excitation on gain coefficient calculations for the ion Fe XVII. We find substantial differences (factors of about 1.3--3) between gain coefficient calculations with and without the inclusion of resonances at low temperatures. However, these effects are not important at the temperatures considered by Feldman, Seely, and Bhatia for Fe XVII.

• Research Organization: E. O. Hulburt Center for Space Research, Naval Research Laboratory, Washington, DC 20375-5000
• OSTI ID: 6401811
• Journal Information: J. Appl. Phys.; (United States), Vol. 58:11
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
ELECTRON-ION COLLISIONS
AUTOIONIZATION
ELECTRON CAPTURE
EXCITATION
IRON IONS
X-RAY SPECTRA
X-RAY LASERS
GAIN
ELECTRON COLLISIONS
POPULATION INVERSION
RESONANCE
AMPLIFICATION
CAPTURE
CHARGED PARTICLES
COLLISIONS
ENERGY-LEVEL TRANSITIONS
ION COLLISIONS
IONIZATION
IONS
LASERS
SPECTRA
420300* - Engineering- Lasers- (-1989)