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Effective mass of the normal negative-charge carrier in bulk He II.

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<mark>Journal publication date</mark>28/06/1982
<mark>Journal</mark>Physical review letters
Issue number26
Number of pages4
Pages (from-to)1834-1837
Publication statusPublished
Original languageEnglish


The first acceleration measurements are reported for negative ions in bulk superfluid 4He. Data recorded at 70 mK, 25 bars for electric fields in the range 80 < E < 150 V are consistent with an ionic dispersion relation identical to that of a free particle with mass (87 ± 5)m4, where m4 is the 4He atomic mass.