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We report a study of implantation and optical spectroscopy of foreign atoms in a solid-helium matrix. With a sample of more than 10⁹ Ba atoms in 1 cm³, a storage time in excess of 5 hours has been demonstrated. Laser-induced fluorescence studies favor the assumption that the isotropy of the trapping site for the implanted atoms is preserved during the liquid-to-solid phase transition.
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Kanorsky et al. (1994) studied this question.
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