The electron affinity of tungsten
Department of Physics, University of Gothenburg, 412 96 Gothenburg, Sweden
2 Institut für Physik, Johannes Gutenberg-Universität, Mainz, 55099 Mainz, Germany
3 Faculty of Physics, University of Vienna, 1090 Wien, Austria
4 Present Address: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
Published online: 27 July 2010
The electron affinity of tungsten has been measured using laser photodetachment threshold spectroscopy in a collinear geometry. The electron affinity was determined to 6583.6(6) cm-1 by observing the onset of the process when W- ions in the 6S5/2 ground state are photodetached producing neutral W atoms in the 5D0 ground state. The measured value is in agreement with previous measurements and improves the accuracy by almost two orders of magnitude. Further, a photodetachment signal below the ground state photodetachment threshold was found, which indicates the existence of a bound excited state in W-.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2010