Zobrazeno 1 - 10
of 40
pro vyhledávání: '"Humphrey J"'
Autor:
Yiming Xing, Humphrey J. Maris
Publikováno v:
Journal of Low Temperature Physics. 201:634-657
We present a review of the properties of negative ions that are produced when electrons are inserted into superfluid helium-4. It is convenient to divide the ions into two groups. The first is the ion usually referred to as the “normal electron bub
Publikováno v:
Journal of Low Temperature Physics. 201:122-127
In 1970, Doake and Gribbon reported the discovery of a negative ion in superfluid helium that has a mobility about six times higher than the mobility of the normal electron bubble. We report on measurements of the variation of the mobility of this
Autor:
Emil Joseph, A. Pal, Vaisakh Vadakkumbatt, Humphrey J. Maris, Ambarish Ghosh, Vinod Srinivasan, Neha Yadav
Publikováno v:
Journal of Low Temperature Physics. 188:101-111
Multielectron bubbles (MEBs) are charged cavities in liquid helium which provide an interesting platform for the study of electrons on curved surfaces. Very recently, we have reported an experiment to trap these objects in a two-dimensional Paul trap
Publikováno v:
Journal of Low Temperature Physics. 187:618-626
An electron bubble in liquid helium-4 under the saturated vapor pressure becomes unstable and explodes if the pressure becomes more negative than −1.9 bars. In this paper, we use focused ultrasound to explode electron bubbles. We then image at 30,0
Autor:
Humphrey J. Maris, Yunhu Huang
Publikováno v:
Journal of Low Temperature Physics. 186:208-216
We present the results of computer simulations of the motion of an electron bubble through superfluid helium-4 when acted upon by an electric field. The simulations are based on an extended version of the Gross–Pitaevskii equation. The temperature
Publikováno v:
Journal of Low Temperature Physics. 185:313-323
Exotic ions are negatively charged objects which have been detected in superfluid helium-4 at temperatures in the vicinity of 1 K. Mobility experiments in several different labs have revealed the existence of at least 18 such objects. These ions have
Publikováno v:
Journal of Low Temperature Physics. 178:78-117
An electron in liquid helium forces open a cavity referred as an electron bubble. These objects have been studied in many past experiments. It has been discovered that under certain conditions other negatively charged objects can be produced but the
Publikováno v:
Journal of Low Temperature Physics. 171:178-186
We have constructed a new apparatus designed to study the exotic negative ions in superfluid helium-4 previously observed. Our apparatus is similar to that used by Ihas and Sanders, and by Eden and McClintock. The ions are generated from an electrica
Autor:
Humphrey J. Maris, Sébastien Balibar
Publikováno v:
Journal of Low Temperature Physics
In 2004 Kim and Chan performed a torsional oscillator measurement of the rotational inertia of solid helium-4. They found frequency changes which were interpreted in terms of a non-classical rotational inertia, that is a partial superfluidity or "sup
Autor:
D. Jin, Humphrey J. Maris
Publikováno v:
Journal of Low Temperature Physics. 162:329-339
We describe experiments in which a sound pulse is used to inject small particles into liquid helium at temperatures between 1 and 3 K. The motion of these particles is then observed. We are able to observe the effect of applying an impulse to a parti