The resonance of charge carriers trapped under the surface of He II is observed at 200 MHz. The effective masses are found to be m₊*=(45±2)m₄ and m_-*=(76±2)m₄, where m₄ is a bare ⁴He mass. The ionic radii are deduced to be R₊=6.0±0.1 {} and R_-=11.4±0.1 {}.
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J. Poitrenaud (1972) studied this question.
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