Temperature Variation of the Elementary Excitation Spectrum of Thin Liquid 4He Films

Abstract

The temperature variation of the elementary excitation spectrum of thin liquid (4)He films is derived within the ring diagram approximation. This theory is microscopic only in the long wavelength limit. Using this anomalous spectrum, the specific heat data adsorbed on Grafoil graphite and the first, second and third sounds are analyzed. The temperature variation of the phonon spectrum is very negligible for low temperatures. However, with increasing temperature from 0.6 - 0.7 K to near the vicinity of the two-dimensional transition temperature of 1-.21 K, the temperature effect is significant regarding the physical properties of thin liquid (4)He films.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1992
Accession Number
ADA253416

Entities

People

  • Chung-in Um
  • Sang-tahk Nam
  • Soo-Young Lee
  • Thomas F. George

Organizations

  • Washington State University

Tags

Communities of Interest

  • C4I
  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Chemistry
  • Distribution Functions
  • Energy Gaps
  • Equations
  • Experimental Data
  • Frequency
  • Ground State
  • Long Wavelengths
  • Low Temperature
  • Military Research
  • Physical Properties
  • Physics
  • Quasiparticles
  • Specific Heat
  • Transition Temperature
  • Two Dimensional
  • Universities

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Molecular Photonics/Laser Physics