PROTON EXCITATION OF THE 2s2 2p5 2 P3/2 -2s22p5 2P1/2 TRANSITION IN FLUORINE-LIKE Ti XIV and Ni XX

F.P. KEENAN; R.H.G. REID; S.M. McCANN

doi:doi:10.1051/jphyscol:1989160

Numéro		J. Phys. Colloques Volume 50, Numéro C1, Janvier 1989 International Conference on the Physics of Multiply Charged Ions and International Workshop on E.C.R. Ion Sources


Page(s)		C1-565 - C1-569
DOI		https://doi.org/10.1051/jphyscol:1989160

International Conference on the Physics of Multiply Charged Ions and International Workshop on E.C.R. Ion Sources

J. Phys. Colloques 50 (1989) C1-565-C1-569
DOI: 10.1051/jphyscol:1989160

PROTON EXCITATION OF THE 2s² 2p⁵ ² P_3/2 -2s²2p⁵ ²P_1/2 TRANSITION IN FLUORINE-LIKE Ti XIV and Ni XX

F.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

Abstract
Rate coefficients for excitation of the 2s²2p⁵ ²P_3/2 - 2s²2p⁵ ²P_1/2 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 ²P_3/2 - 2s²2p⁵ ²P_1/2 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 ²P_3/2 - 2 s²2P⁵²P_1/2)/I(2s²2P⁵²P_3/2 - 2s2p⁶ ²S_1/2) and R₂ = I(2s²2p⁵ ²P_3/2 - 2s²2p⁵ ²P_1/2)/I(2s²2p⁵²P_1/2 - 2s2p⁶ ²S_1/2), although the theoretical values of R₁ and R₂ are strongly dependant on the magnitude of the proton excitation rate for 2s²2p⁵ ²P_3/2 - 2s²2p⁵ ²P_1/2. The accurate calculation of this quantity for Ti XIV and Ni XX is therefore of great importance.