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Large isotope shifts in the ground state of an acceptor A₂ (Eᵥₐₗ+11.31 meV) and a donor D (Econd-12.34 meV) have been observed for the first time with photoelectric spectroscopy in pure germanium. The shifts (ΔE^A₂=+21±3 {μ}eV; ΔED=-51±3 {μ}eV) occur in germanium crystals grown in deuterium instead of hydrogen. A₂ and D are observed at concentrations 4×{}10¹¹ cm^-3. The isotope shift is a direct proof that the centers A₂ and D contain hydrogen.
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E. E. Häller (1978) studied this question.
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