Study of Exotic Ions in Superfluid Helium-4 Using a Carbon Nanotube Source

27th International Conference on Low Temperature Physics

Wei, W.^1 ; Xie, Z.-L.^1 ; Yang, Y.^1 ; Seidel, G.M.^1 ; Maris, H.J.^1

Department of Physics, Brown University, Providence

RI

02912, United States^1

关键词: Electrical discharges;    Electron bubbles;    Flight methods;    Liquid surface;    Measurements of;    Negatively charged;    Stainless steel wires;    Tungsten tip;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/568/1/012011/pdf
DOI  :  10.1088/1742-6596/568/1/012011

来源: IOP

【 摘 要 】

We have extended our measurements of the properties of exotic negatively-charged ions in superfluid helium-4. We measured the ion mobility using the time-of-of-flight method at temperatures in the range between 1.03 and 1.16 K. Ions were generated by an electrical discharge produced by applying a voltage to sharp tips in the helium vapor above the liquid surface. Previous studies by Ihas and Sanders, Eden and McClintock, and by our group used tungsten tips and were able to detect at least twelve exotic ions in addition to the normal electron bubble. In the present work we have experimented with tips each consisting of a stainless steel wire coated with carbon nanotubes. We have found that with these tips the strength of the exotic ion signal is substantially increased making it possible to detect several ions which previously could not be seen. The present data combined with the results of the previous studies indicate that there are at least eighteen exotic ions with different mobility.