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

Research output: Contribution to journalJournal article


Journal publication date28/06/1982
JournalPhysical Review Letters
Journal number26
Number of pages4
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.