The electron affinity of astatine
David Leimbach, et al.
Received Date: 11th February 20
David Leimbach, Julia Sundberg, Yangyang Guo, Rizwan Ahmed, Jochen Ballof, Lars Bengtsson, Ferran Boix Pamies, Anastasia Borschevsky, Katerina Chrysalidis, Ephraim Eliav, Dmitry Fedorov, Valentin Fedosseev, Oliver Forstner, Nicolas Galland, Ronald Fernando Garcia Ruiz, Camilo Granados, Reinhard Heinke, Karl Johnston, Agota Koszorus, Ulli Koester, Moa K. Kristiansson, Yuan Liu, Bruce Marsh, Pavel Molkanov, Lukas F. Pastevka, Joao Pedro Ramos, Eric Renault, Mikael Reponen, Annie Ringvall-Moberg, Ralf Erik Rossel, Dominik Studer, Adam Vernon, Jessica Warbinek, Jakob Welander, Klaus Wendt, Shane Wilkins, Dag Hanstorp, Sebastian Roth
One of the most important properties influencing the chemical behavior of an element is the energy released with the addition of an extra electron to the neutral atom, referred to as the electron affinity (EA).
Among the remaining elements with unknown EA is astatine, the purely radioactive element 85.
Astatine is the heaviest naturally occurring halogen and its isotope 211At is remarkably well suited for targeted radionuclide therapy of cancer.
With the At- anion being involved in many aspects of current astatine labelling protocols, the knowledge of the electron affinity of this element is of prime importance. In addition, the EA can be used to deduce other concepts such as the electronegativity, thereby further improving the understanding of astatine's chemistry.
Here, we report the first measurement of the EA for astatine to be 2.41578(7) eV. This result is compared to state-of-the-art relativistic quantum mechanical calculations, which require incorporation of the electron-electron correlation effects on the highest possible level.
The developed technique of laser-photodetachment spectroscopy of radioisotopes opens the path for future EA measurements of other radioelements such as polonium, and eventually super-heavy elements, which are produced at a one-atom-at-a-time rate.
Read in full at arXiv.
This is an abstract of a preprint hosted on an independent third party site. It has not been peer reviewed but is currently under consideration at Nature Communications.