Beam-Foil Study of Titanium in the EUV Using Foils of Different Materials

Abstract

The ultraviolet spectrum (λ8-60 nm) of highly ionized titanium after foil excitation of 15 and 20 MeV fast ions has been recorded. A number of new lines, mainly in sodiumlike Ti XII, are identified. Line intensity ratios and decay curves are measured in selected cases. Using foils of different materials, relative intensities of yrast transitions n = 3-6 are evaluated and intercompared with the aid of cascade models. Decay curves of yrast levels are studied for resonance effects in the population mechanism. Little evidence is found for such effects.

Time resolved EUV spectroscopy on foil-excited 5.9 MeV/u Xe and 13.2 MeV/u Au ions

“…Contrary to experience with beam-foil spectra at lower nuclear charge Z (for an example see [28]), the 3s-3p resonance lines and the 3p-3d cascade transitions of Na-like ions are not particularly prominent in the present spectra of Xe and Au (Figs. 2, 3).…”

Identification ofn=3,?n = 0 transitions of Ne I-like Ti XIII in the beam-foil spectrum of titanium

“…In addition the lifetimes of the levels are needed because of the inherent temporal resolution of the fast beam light source. An observed flight path corresponding to 80 ps has been assumed in the simulation to approximate the conditions of the experiment [1]. The detection efficiency curve of the spectrometer plus detector [20] was taken into account.…”

“…The well known spectral lines corresponding to the seven ground state transitions have wavelengths near 2nm and are outside the range accessible to the experimental set-up used [1]. The other lines are spread over a range from about 12 to 70nm.…”

“…The other lines are spread over a range from about 12 to 70nm. Our experimental data [1] which have been recorded with appropriate spectral resolution up to 2=53nm were extended up to 58nm to cover the full range of the thirty-odd strongest lines.…”

“…The EUV spectrum 9nm<2_<52nm of foil excited titanium has been observed recently [1]. In that experiment, the ion beam energy (15 to 20 MeV) was optimized for the production of Ti 11 § according to the prescription given by Sayer [2].…”