L.
Orozco
Kalita, M., Behr, J. A., Gorelov, A., Pearson, M. R., DeHart, A., Gwinner, G., … Flambaum, V. V. (2018). Isotope shifts in the 7s→8s transition of francium: Measurements and comparison to ab initio theory. Physical Review A, 97. http://doi.org/10.1103/physreva.97.042507 (Original work published April 2018)