Detailed information about the configuration of electrons around the actinium nucleus has been obtained in a study of emission spectra of actinium recently completed by W. F. Meggers, Chief of the National Bureau of Standards spectroscopy laboratory. The results also establish that
the elements following actinium in the periodic table form a series of "rare earths" analogous to the series that follows lanthanum. (1) The spectrograms were made by M. Fred and F. S. Tomkins of the Argonne National Laboratory, and the actinium for the study was produced at the Argonne
laboratory by transmuting radium.
The Society publishes the internationally recognized, peer reviewed journal, Applied Spectroscopy, which is available both in print and online. Subscriptions are included with membership or can be purchased by institutional or corporate organizations. Abstracts may be viewed free of charge. Previously published as Bulletin (Society for Applied Spectroscopy)