Zobrazeno 1 - 10
of 67
pro vyhledávání: '"Humphrey J"'
Autor:
Humphrey J. Maris, Yiming Xing
Publikováno v:
Journal of Low Temperature Physics. 202:399-409
We present calculations of the properties of bubbles in liquid helium-4 containing 3 or 8 electrons. The pressure range in which these bubbles are stable is determined. For Z =3, we find that the bubbles are unstable except in a pressure range betwee
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
Publikováno v:
Journal of Low Temperature Physics. 201:114-121
We report on studies of positive ions in superfluid helium-4. In addition to the positive ion that has been previously studied, we have been able to detect two more positive ions with slightly different mobility, and the results show some evidence fo
Publikováno v:
Journal of Low Temperature Physics. 192:48-64
We report on experiments in which we study cavitation resulting from electrons in liquid helium. Electrons are introduced into the liquid by a radioactive source. After an electron comes to rest in the liquid, it forces open a small cavity referred t
Publikováno v:
Journal of Low Temperature Physics. 189:53-59
We report on experiments in which focused laser light is used to induce optical breakdown in liquid helium-4. The threshold intensity has been measured over the temperature range from 1.1 to 2.8 K with light of wavelength 1064 nm. In addition to the
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