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4d → 4f Excitation in Lanthanide Vapours

Published online by Cambridge University Press:  25 September 2017

E. R. Radtke
E. R. Radtke*
Affiliation:
Physikalisches Institut der Universitat Bonn, Nussallee 12, 53 Bonn, Germany

Extract

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Since the last VUV conference in Hamburg, there has been speculation on the possible occurrence of collective effects in the 4d-f excitation channels of the lanthanide sequence. However, the data available so far has been restricted to solids, with the exceptions of Barium and Europium, due to the need for a high temperature absorption cell.

In the present paper we report the first observation of the 4d-f ‘Giant Resonance’ for the atomic vapours of Lanthanum, Samarium and Cerium using a 42 cm long induction furnace working up to 2700 K. The spectra were calibrated by superposing the emission lines from a Garton flash tube.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 43: Vth Conference on UV & X-Ray Spectroscopy of Astrophysical & Laboratory Plasmas , July 1977 , pp. 8
Copyright
Copyright © Crown Research Institutes 1977