Laser applications and other topics in quantum electronics

Modelling of multistage selective photoionisation in a three-dimensional cavity

R. I. Golyatina, A. N. Tkachev, S. I. Yakovlenko

Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow

Abstract: An analysis is made of physical models of selective three-stage photoionisation of a vapour in a three-dimensional cavity. These models have been used in theoretical analyses of preparation of significant amounts of highly enriched ¹⁶⁸Yb by the AVLIS (atomic-vapour laser isotope separation) method. A comparison of the model predictions with experiments shows that a three-dimensional model ignoring the absorption of laser radiation in a medium describes well the experimental results obtained for the second and third ionisation stages. The first excitation stage is described satisfactorily by a model in which absorption is included. A comparison of the calculated and experimental results is used to find the coefficient (65%) representing ion extraction from a laser plasma.

PACS: 28.60.+s, 42.62.Cf, 42.60.Da

Received: 26.02.1998

 English version: Quantum Electronics, 1998, 28:8, 744–748

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