Wavelengths, oscillator strengths and radiative transition rates for Kα lines in titanium x-ray spectra

Abstract

The oscillator strengths, line strengths and wavelengths are presented for all 1s–2p transitions in titanium ions. X-ray emission from titanium is extensively used, for example for diagnosis, in fusion experiments. The Kα 1s–2p transitions are limited to transitions from helium-like to fluorine-like ion as the 2p subshell is filled beyond fluorine. While there are two 1s–2p transitions (1s2S1/2–2p2P1/2 and 1s2S1/2–2p2P3/2) for hydrogen-like titanium, Ti20+, the number varies depending on the number of electrons in the 2p subshell before and after the transition. For example, there are 35 1s–2p transitions giving the same number of Kα lines for carbon-like titanium, Ti16+. The present results are obtained from configuration interaction atomic structure calculations using the code GRASPVU, which includes relativistic effects in the Dirac–Fock approximation. The results have been benchmarked for a few ionic states. A comparison of our results with the very few transitions in the literature as well as those from other codes shows reasonable accuracy of the present results.