Ph.D. Thesis: High Resolution Spectroscopy of Singly Charged Ions
by
Jonas Gurell(Stockholm University, Department of Physics)
→
Europe/Stockholm
FB42
FB42
Description
This thesis presents measurements of fundamental properties of singly charged ionic systems
including spectral wavelengths, lifetimes of excited states and branching fractions with the main
focus on time resolved laser spectroscopy of stored ions providing lifetime measurements of
metastable states. The results of these measurements have been used to determine energy levels
and transition probabilities of the studied systems. The included experimental data are compared
with results from calculations which provides evaluations of different theoretical models. The
presented results have been applied by others to the field of atomic astrophysics in order to
deduce electron densities and elemental abundances in ejecta of the supermassive star eta Carinae
and have also been followed by additional work of theoreticians interested in comparisons with
laboratory data. The thesis is a result of several collaborations in which Stockholm University has
been providing lifetime measurements of metastable states, Lund Observatory and the National
Institute of Standards and Technology have been providing wavelength and branching fraction
measurements, Lund Laser Centre has been providing lifetime measurements of short-lived states
and calculations have been performed by theoretical physicists from Université de Mons-Hainaut,
Université de Liège, Queen's University of Belfast and Laboratoire Aimé Cotton.