Absorption Spectra of Cerium, Neodymium and Samarium

Abstract

A modified King electric furnace, charged with, rare earth salts, has been used to observe the absorption spectra of cerium, neodymium and samarium in the region 12,000A to 2500A with a 21-ft. concave grating giving dispersion of 2.5A/mm in the first order. The observations include 600 lines in cerium, 450 in neodymium, and 1500 in samarium. In general the absorption data confirm the line types as given by King's temperature classification in that, of those lines which are absorbed, the class I lines are more strongly absorbed than class II lines, which are in turn stronger than class III lines, and provide additional data in that only those lines of each class which involve the lowest levels appear in absorption.

Correlation effects in La, Ce, and lanthanide ions

“…Preliminary analysis of the first spark spectrum of Ce and Ce + was performed by Albertson and Harrison [30] which identified the 4f 5d6s and 4f 5d 2 as the lowest configuration in Ce + . Absorption spectra of cerium was recorded by Paul [31] where approximately 600 lines were observed. For wavelengths less than 320 nm, the intensity of the absorption lines falls off very rapidly and very few were observed.…”

Continuum source atomic absorption spectrometry and detector technology: A historical perspective

“…Later, electrically heated tubular graphite furnaces, originally developed around 1905 by King [7] for studying thermal emission spectra, also came to be used as atomizers for absorption spectroscopy. Between 1935 and 1937, Paul [8,9] described the measurement of absorption spectra of silver, manganese and the rare earth elements cerium, neodymium and samarium. Particularly remarkable in this work is the application of different continuum sources for different spectral ranges: a high-power tungsten filament lamp for the visible and a hydrogen discharge lamp as well as the hot anode of a carbon arc for the UV.…”

High resolution measurements of hyperfine structure and isotope shifts in 9 spectral lines of Nd I

“…Extensive classical spectroscopic investigations [1][2][3][4][5] resulted in the identification of a large number of energy levels. Extensive classical spectroscopic investigations [1][2][3][4][5] resulted in the identification of a large number of energy levels.…”