Neutron-scattering study of the structure of adsorbed helium monolayers and of the excitation spectrum of few-atomic-layer superfluid films

Journal Article · Mon Dec 20 04:00:00 EST 1976 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.37.1695· OSTI ID:7134837

Carneiro, K; Ellenson, W D; Passell, L; McTague, J P; Taub, H

Elastic diffraction of neutrons from helium adsorbed on Grafoil shows that the surface monolayer forms as a highly compressed, ordered triangular lattice incommensurate with the structure of the underlying graphite basal planes. Inelastic scattering from thin superfluid films on top of the surface monolayers reveals the existence of bulklike rotons in films containing on average as few as three layers of atoms. (AIP)

• Research Organization: Brookhaven National Laboratory, Upton, New York 11973
• OSTI ID: 7134837
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 37:25; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ADSORPTION
BARYONS
CARBON
COHERENT SCATTERING
DIFFRACTION
ELASTIC SCATTERING
ELEMENTARY PARTICLES
ELEMENTS
EVEN-EVEN NUCLEI
FERMIONS
FILMS
FOILS
GRAPHITE
HADRONS
HELIUM 4
HELIUM II
HELIUM ISOTOPES
INELASTIC SCATTERING
ISOTOPES
LAYERS
LIGHT NUCLEI
NEUTRON DIFFRACTION
NEUTRON SPECTROSCOPY
NONMETALS
NUCLEI
NUCLEONS
PROTONS
SCATTERING
SORPTION
SPECTROSCOPY
STABLE ISOTOPES
SUPERFLUIDITY