Abstract

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. <i>(1)</i> 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.

Progress of Radiometric Observation of Infrared Atomic Emission Spectra

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J. Opt. Soc. Am. 50(12) 1171-1175 (1960)

The Observation of Extraphotographic Infrared Atomic Emission Spectra

Curtis J. Humphreys and Edward Paul
Appl. Opt. 2(7) 691-698 (1963)

Soil emissivity and reflectance spectra measurements

José A. Sobrino, Cristian Mattar, Pablo Pardo, Juan C. Jiménez-Muñoz, Simon J. Hook, Alice Baldridge, and Rafael Ibañez
Appl. Opt. 48(19) 3664-3670 (2009)

Infrared Emission Spectra of Quartz*

Tunis Wentink and Walter G. Planet
J. Opt. Soc. Am. 51(6) 595-600 (1961)

Emission Spectra of the Rare Earth Elements*

William F. Meggers
J. Opt. Soc. Am. 31(2) 157-159 (1941)