Investigation of Ti III line broadening in a laser-induced plasma

Abstract

Time-resolved spectroscopy was used to study the plasma emission induced by a 1064 nm, 10 ns pulsed laser ablation titanium during the early phase of between 60–200 ns in an atmospheric environment. The line intensity evolution of Ti III and Ti II was analysed in terms of the delay time, as well as the plasma temperature and electron density, based on the observed spectra. The Stark broadening for two Ti III lines at 237.4986 and 241.3989 nm was measured. Since the self-absorption of the lines was not observed in our experiment, its influence on the lines was assumed to be negligible. Moreover, a modified semi-empirical approach was used to calculate the Stark broadening for the two lines and generally good agreement was obtained between the theoretical results and experimental data.

Atomic spectrometry updates: Review of advances in atomic spectrometry and related techniques

“…Aguilera et al 105 reported the measurement of Stark widths of 53 Ni(II) lines in the LIBS spectrum using an experimental procedure based on accurate measurement of the electron density through the Stark broadening of the H a line. In a similar way, the Stark broadening of two Ti(III) lines were measured by Chen et al 106 during the early phase (i.e., between 60 and 200 ns) of the ablation process. At this point, it should be noted that Parigger 107 reviewed the limitations on the use of hydrogen Balmer series for the calculation of Stark broadening, and thus for the determination of electron number density under certain conditions.…”