THE SPECTROSCOPY OF URANIUM ATOM WITHIN THE "SILVA" PROGRAM

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Submitted on 1 Jan 1987

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THE SPECTROSCOPY OF URANIUM ATOM WITHIN THE ”SILVA” PROGRAM

R. Avril, J. Ebrardt, A. Petit, F. Viala, E. Vors

To cite this version:

R. Avril, J. Ebrardt, A. Petit, F. Viala, E. Vors. THE SPECTROSCOPY OF URANIUM ATOM

WITHIN THE ”SILVA” PROGRAM. Journal de Physique Colloques, 1987, 48 (C7), pp.C7-691-C7-

691. �10.1051/jphyscol:19877171�. �jpa-00226995�

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JOURNAL DE PHYSIQUE

Colloque C7, suppl6ment au n012, Tome

48,

d6cembre

1987

THE SPECTROSCOPY OF URANIUM ATOM WITHIN THE "SILVA" PROGRAM

R. AVRIL, J. EBRARDT, A. PETIT,

F.

VIALA and E. VORS

D6partement de Physico-Chimie, Service de Photophysique et Photochimie, Section de Photochimie Appliquee, CEN-Saclay:

F-91191 Gif-sur-Yvette Cedex. France

Atomic vapor laser isotope separation (SILVA) has been recognized as beeing an attractive powerful technique for the enrichment of uranium for light water reactor fuel. Since the heart of the AVLIS process is based on selective multistep photoionization of an uranium atomic vapor stream, the development of this process in France, has stimulated intensive studies in the field of uranium spectroscopy.

The multistep photoionization of uranium atoms implies to choose, preliminarily, an irradiation scheme and this choice is only possible if a certain number of spectroscopic parameters are known (oscillator strengths, isotopic shifts, hyperfine structures, lifetimes

...

^1. Several spectroscopic techniques have been investigated to measure these parameters ; for each parameter the most appropriate technique has been chosen.

Some of these parameters (e.g. transition oscillator strengths) must be very accurately measured, since the resulting excitation cross sections determine the laser fluences needed for effective atomic photoionization: in this case different methods are needed.

We review in this article several different spectroscopic techniques used at Saclay and give, as an example, typical results obtained for a photoionization sequence ( 0

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^34659).

Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:19877171