Experimental transition probabilities for 4p – 4d spectral lines in V II

Abstract

Aims. We aim to measure lifetimes of levels belonging to the 3d3(4F)4d subconfiguration in V II, and derive absolute transition probabilities by combining the lifetimes with experimental branching fractions. Methods. The lifetimes were measured using time-resolved laser-induced fluorescence in a two-photon excitation scheme. The branching fractions were measured in intensity calibrated spectra from a hollow cathode discharge lamp, recorded with a Fourier transform spectrometer. Results. We report lifetimes for 13 levels at an energy around 73 000 cm−1. Absolute transition probabilities of 78 lines are derived by combining the lifetimes and branching fractions. The experimental values are compared with theoretical data from the literature.

Design and optimization of a laser-PIXE beamline for material science applications

“…At first, we aim at focusing/defocusing the proton beam using a single quadrupole and for the total length of the beamline (Fig. 1) we consider a case with 50 cm total length (this represents a compact beamline that can be easily adapted to a medium/large vacuum chamber (Fuchs et al, 2005;Barberio et al, 2017b;Nilsson et al, 2019;Vallières et al, 2019) and a case with 80 cm total length [an extended version where the range of the final spot size of the beam is broader but presumably requires an extension if implemented in a chamber of common dimensions, which can also be desirable for inserting additional diagnostics (Bolton et al, 2014)]. Secondly, we study the case where two quadrupoles are used, in a FODO configuration, in order to focus/defocus the beam.…”