Shifts of the cyclotron mode frequencies, away from the single particle limit, are observed to
be proportional to the measured E× B rotation frequency in a non-neutral ion plasma. These
cylindrical ion plasmas consist of 24 Mg+, 25 Mg+, and 26 Mg+; with H 3 O+, and O 2+
impurities. Laser cooling of the 24 Mg+ majority species enables temperature control over
the range 10− 5< T< 10− 2 eV, as well as determination of cyclotron mode frequencies from
launched wave absorption. At moderately low temperatures, the m θ= 1 and m θ= 2 …

Shifts of cyclotron mode frequencies away from the single particle φ c are observed to be
proportional to the E xB rotation frequency in non-neutral ion plasmas. These cylindrical ion
plasmas consist of Mg24^+, Mg25^+, and Mg26^+, with H 3 O^+, O 2^+ and H 2^+
impurities. Laser cooling of the majority species, Mg24^+, enables temperature control over
the range 10-5< T< 1. eV, as well as determination of cyclotron mode frequencies from
launched wave absorption. At moderately low temperatures, the m= 1 and m= 2 cyclotron …