J. Phys. Colloques
Volume 50, Numéro C1, Janvier 1989International Conference on the Physics of Multiply Charged Ions and International Workshop on E.C.R. Ion Sources
|Page(s)||C1-565 - C1-569|
J. Phys. Colloques 50 (1989) C1-565-C1-569
PROTON EXCITATION OF THE 2s2 2p5 2 P3/2 -2s22p5 2P1/2 TRANSITION IN FLUORINE-LIKE Ti XIV and Ni XXF.P. KEENAN1, R.H.G. REID2 and S.M. McCANN1
1 Department of Pure and Applied Physics, Queen's University of Belfast, Belfast BT7 1NN, IR-Northern, Ireland
2 Department of Applied Mathematics and Theoretical Physics, Queen's University of Belfast, Belfast BT7 1NN, IR-Northern, Ireland
Rate coefficients for excitation of the 2s22p5 2P3/2 - 2s22p5 2P1/2 transition in fluorine-like Ti XIV and Ni XX by proton impact have been calculated using the close-coupled impact parameter method. These data are significantly different from earlier results with, for example, our proton rates for Ti XIV being approximately a factor of five smaller than those of Bely and Faucher (1970) at low temperatures. We show that the 2s22p5 2P3/2 - 2s22p5 2P1/2 transition in Ti XIV and Ni XX may be used to infer the electron density or ion temperature of a laboratory plasma through the diagnostic emission line ratios R1 = I(2s22p5 2P3/2 - 2 s22P52P1/2)/I(2s22P52P3/2 - 2s2p6 2S1/2) and R2 = I(2s22p5 2P3/2 - 2s22p5 2P1/2)/I(2s22p52P1/2 - 2s2p6 2S1/2), although the theoretical values of R1 and R2 are strongly dependant on the magnitude of the proton excitation rate for 2s22p5 2P3/2 - 2s22p5 2P1/2. The accurate calculation of this quantity for Ti XIV and Ni XX is therefore of great importance.