Collisional rate coefficients for the iron ions Fe(VIII), Fe(IX), and Fe(X)

Journal Article · Mon Sep 01 04:00:00 EDT 1975 · Phys. Rev., A, v. 12, no. 3, pp. 1076-1083

DOI:https://doi.org/10.1103/PhysRevA.12.1076· OSTI ID:4183913

Datla, R U; Blaha, M; Kunze, H

Relative values of rate coefficients for excitation by electron collisions were determined experimentally for various transitions in Fe viii, Fe ix, and Fe x at two plasma conditions in a small theta-pinch. Collisional ionization rates were also obtained for these ions. The maximum errors of the relative values of the excitation rate coefficients are estimated to be plus-or- minus30% to plus-or-minus40% and those of the ionization rates to be a factor of 1.5. Iron pentacarbonyl Fe (CO)$sub 5$ was used as an impurity in hydrogen or helium gases. The electron temperature and density were obtained from the analysis of scattered laser light. They were in the range 60--150 eV and 10$sup 15$ to 2 times 10$sup 16$ cm$sup -3$, although this range was not available for each ion. The excitation rate coefficients were calculated by the use of the Coulomb-Born approximation. Comparison with experiment is made within each ion and also between ionization stages. A discrepancy in previous Coulomb-Born calculations is noted for the case of Fe viii.

• Research Organization: Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742
• Sponsoring Organization: USDOE
• NSA Number: NSA-33-002774
• OSTI ID: 4183913
• Journal Information: Phys. Rev., A, v. 12, no. 3, pp. 1076-1083, Journal Name: Phys. Rev., A, v. 12, no. 3, pp. 1076-1083; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

*HOT PLASMA-- ELECTRON-ION COLLISIONS
*IRON IONS-- ELECTRON-ION COLLISIONS
700104* --Fusion Energy--Plasma Research--Plasma Kinetics-- Experimental
BORN APPROXIMATION
ELECTRON DENSITY
ELECTRON TEMPERATURE
IONIZATION
N70400* --Physics--Controlled Thermonuclear Research-- Kinetics (Experimental)
THETA PINCH