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

¹ Lund Observatory, Lund University, Box 43, 22100 Lund, Sweden
e-mail: hampus.nilsson@astro.lu.se
² Department of Physics, University of Gothenburg, 412 96 Gothenburg, Sweden
³ Department of Physics, Lund University, Box 118, 22100 Lund, Sweden
⁴ Applied Mathematics and Material Science, Malmö University, 20506 Malmö, Sweden

Received: 7 December 2018
Accepted: 2 January 2019

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.