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2 edition of Experimental studies of the behaviour of ions beneath the surface of superfluid helium-4 found in the catalog.

Experimental studies of the behaviour of ions beneath the surface of superfluid helium-4

Janice Meredith

# Experimental studies of the behaviour of ions beneath the surface of superfluid helium-4

## by Janice Meredith

• 12 Want to read
• 4 Currently reading

Published by University of Birmingham in Birmingham .
Written in English

Edition Notes

Thesis (Ph.D.)-University of Birmingham, School of Physics and Space Research.

 ID Numbers Statement by Janice Meredith. Open Library OL13891254M

Studies of ion mobility in superfluid helium-4 have revealed the existence of a number of negatively charged objects in addition to the well-studied normal electron bubble (NEB). Doake and Gribbon [1] produced ions in the liquid using an. α. source, and discovered an ion now called the “fast ion” which. The superfluid fraction not vanish linearly at the transition point The normal fraction does not vanish as T^{3/2} at zero temperature There can be no superfluidity if the spectrum of excitations scales quadratically in momentum [cf Kelvin waves excited by wind on water].

"Solid helium-4 appears to behave like a superfluid when it is so cold that the laws of quantum mechanics govern its behavior," says Moses H. W. Chan, .   Comprehensive tables of the primary thermodynamic properties of superfluid helium‐4, such as the specific heat and entropy, are presented as computed from the Landau quasiparticle model, with the aid of inelastic neutron scattering data. The neutron data are presented by continuous functions of temperature pressure, and wave number and certain excitation properties such as number density.

studied) is film flow. Above the surface of SF helium a thin film (few hundred angstroms thick) will form on the cryostat walls and this film is also superfluid. If a test tube is dipped into the SF helium and withdrawn, the test tube will empty as the film flows up the inner wall and down the outer wall to drip back into the main bath. Compared to the extensive experimental and theoretical studies of macroscopic superfluid phenomena, experimental studies of the microscopic details have been sparse because of the lack of adequate probes. A major problem has been that liquid He has a natural ability to cleanse itself of impurities, which either aggregate in the bulk or condense on surfaces.

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### Experimental studies of the behaviour of ions beneath the surface of superfluid helium-4 by Janice Meredith Download PDF EPUB FB2

Studies of the Fast and Exotic Ions in Superfluid Helium by. Wanchun Wei.Brown University,University of Science and Technology of China, A dissertation submitted in partial fulfillment of the requirements for the Degree of Doctor of Philosophy in the Department of Physics at Brown University.

PROVIDENCE. Superfluid helium-4 is the superfluid form of helium-4, an isotope of the element helium.A superfluid is a state of matter in which matter behaves like a fluid with zero substance, which looks like a normal liquid, flows without friction past any surface, which allows it to continue to circulate over obstructions and through pores in containers which hold it, subject only to its.

Abstract. The aim of this paper is to review recent progress in the study of pools of ions trapped below the surface of superfluid 4 He.

A brief description will be given of the way in which the ions are trapped, and it will be explained why the study of the behaviour of the pools is of by: 1. To figure this out, the team came up with an exact simulation of superfluid helium-4 - helium that has been chilled to just 2 degrees above absolute zero.

Absolute zero (0 Kelvin, °C, or °F) is the absolute limit of cold in the Universe. Superfluidity is the characteristic property of a fluid with zero viscosity which therefore flows without any loss of kinetic stirred, a superfluid forms vortices that continue to rotate indefinitely.

Superfluidity occurs in two isotopes of helium (helium-3 and helium-4) when they are liquefied by cooling to cryogenic temperatures.

It is also a property of various other exotic. We report an experimental investigation of energy relaxation of surface electrons on superfluid helium Electrons are heated by resonant microwave radiation which excites electrons from the.

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 electrical discharge in the vapor above the surface of the liquid and the mobility is measured by the time-of-flight method. the study of interesting vortex-line dynamics. However, in flows where the normal fluid, the superfluid, and the vortices have different velocity fields, the behavior of these particles might become difficult to interpret (19, 36, 37).

On the other hand, He* 2 molecular tracers are entrained solely by the normal-fluid com. New experimental results for mobilities in superfluid helium of the alkali earth ions Be +, Mg +, Ca +, Sr + and Ba + in the temperature region from up to K are reported.

Surprisingly, the temperature dependence of the Be + ion mobility, measured here for the first time, is more similar to that of the He + ion than to the heavier alkali earth ions.

This behavior may suggest a. Superfluidity, the frictionless flow and other exotic behaviour observed in liquid helium at temperatures near absolute zero (− °C, or − °F), and (less widely used) similar frictionless behaviour of electrons in a superconducting each case the unusual behaviour arises from quantum mechanical effects.

Discovery. The stable isotopes of helium are helium-3 (or 3 He. An improved ion source based on laser ablation was developed which allows to implant a great variety of impurity ions into liquid helium (4He). This ion source can be operated in the gas phase as well as inside the liquid helium opening up the opportunity to use pressurized liquid helium for the mobility studies also.

Low field mobilities have been remeasured for He+, Ca+, Sr+ and Ba+ ions and. Some experimental applications of positive and negative ions in probing the properties of superfluid helium are described.

Particular emphasis is placed on the breakdown of superfluidity, which can occur either through roton creation or by the production of quantised vortex rings.

Helium (from Greek: ἥλιος, romanized: Helios, lit. 'Sun') is a chemical element with the symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table.

Its boiling point is the lowest among all the is the second lightest and second most abundant element in the observable. Problems of experimental studies of the boiling of superfluid helium (He-II) on a cylindrical heater placed in a porous body are considered.

The experimental setup, experimental cell, control and measurement means, and video recording and data processing methods are described.

The experimental technique and results are presented. THE PHYSICS OF SUPERFLUID HELIUM W. Vinen School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK Abstract The paper contains a brief account of the physics of superﬂuid 4He, with em- phasis on the underlying physical principles; it uses the minimum of mathe.

This review presents a summary of results and a discussion of recent experimental developments in helium droplet spectroscopy with the emphasis laid on infrared studies. Initially, studies focused on single molecules and have been expanded to larger species, such as metal-molecular clusters, biomolecules, free radicals, ions, and proteins.

@article{osti_, title = {THE POSSIBLE SUPERFLUID BEHAVIOUR OF HYDROGEN ATOM GASES AND LIQUIDS}, author = {Hecht, C E}, abstractNote = {The de Boer theory of corresponding states has been suggested as a means of predicting the properties of hydrogen, deuterium, and tritium atoms.

A discussion of the thermodynamic properties would be possible if the electronic spins of the. One of the unusual properties of superfluid helium-4 (helium II) is the fact that, when placed in a container open at the top, it always crawls up the wall and out of the container [1].

This fact is usually ascribed to the phenomenon of wetting owing to which the whole of the surface of the. We report on experimental observations of the deformations of a free surface of superfluid $$^{4}\hbox {He}$$ in the presence of the corona discharge above the liquid. We present an experimental and theoretical study of the 2D dynamics of electrically charged nanoparticles trapped under a free surface of superfluid helium in a static vertical electric field.

Study of Exotic Ions in Superfluid Helium and the Possible Fission of the Electron Wave Function Journal of Low Temperature Physics, JanuaryVolumeIssuepp W. Wei, Z. Xie, L. N. Cooper, G. M. Seidel, H. J.

Maris.An illustration of an open book. Books. An illustration of two cells of a film strip. Video. An illustration of an audio speaker. Audio An illustration of a " floppy disk. Visualization study of counterflow in superfluid helium-4 using metastable helium molecules Item Preview remove-circle.

The same behavior is observed in a solution of 32%c 3He in 4He below the shifted X -point of oK. Thus a finite energy barrier for the emission of electrons from liquid helium seems to be closely related to the superfluid state.