Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Observation of a second critical field for negative ions in He II
AU - Allum, D. R.
AU - McClintock, Peter V. E.
PY - 1976/7/28
Y1 - 1976/7/28
N2 - We have measured the drift velocity v of negative ions in He I1 near 1 K, under a pressure of 25 bar, for electric fields E up to 17 kV/cm. Beyond Ec1, the critical field for creation of stable charged vortex rings, we have observed a second critical field Ec2 at which v passes through a minimum and then starts to increase again. Numerical values of the rate nu at which rings are nucleated, and of the rate P at which the ions escape from the rings again when E > Ec2, are calculated from the experimental data.
AB - We have measured the drift velocity v of negative ions in He I1 near 1 K, under a pressure of 25 bar, for electric fields E up to 17 kV/cm. Beyond Ec1, the critical field for creation of stable charged vortex rings, we have observed a second critical field Ec2 at which v passes through a minimum and then starts to increase again. Numerical values of the rate nu at which rings are nucleated, and of the rate P at which the ions escape from the rings again when E > Ec2, are calculated from the experimental data.
U2 - 10.1088/0022-3719/9/14/002
DO - 10.1088/0022-3719/9/14/002
M3 - Journal article
VL - 9
SP - L371-L375
JO - Journal of Physics C: Solid State Physics
JF - Journal of Physics C: Solid State Physics
SN - 0022-3719
IS - 14
ER -