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The lifetime of electrons trapped at the free surface of liquid ⁴He has been determined from the temperature dependence of the current flow in the liquid. These lifetimes are in substantial agreement with the values determined directly for the liquid-gas interface in ⁴He. New results are presented for the ⁴He-³He interface which give lifetimes as long as 10⁵ sec.
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Williams et al. (1971) studied this question.
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