Quasi-Diffusion between Phonon and Roton Gases in Two- and Three- Dimensional Liquid Helium

Abstract

Temperature variations of the quasi-diffusion constant and thermal diffusion ratio between phonon and roton gases in two and three-dimensional liquid helium are evaluated explicitly through the scattering of phonons by rotons. The diffusion constants in both dimensions decrease exponentially over the whole temperature range, while the thermal diffusion ratios increase and then decrease as temperature increases in the range from about 0.6 to about 1.1 K.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1989
Accession Number
ADA210565

Entities

People

  • C. I. Um
  • C. W. Jun
  • Hye Jung Shin
  • Thomas F. George

Organizations

  • University at Buffalo

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Chemical Engineering
  • Chemistry
  • Diffusion
  • Diffusion Coefficient
  • Low Temperature
  • Materials
  • Materials Science
  • Military Research
  • New York
  • Scattering
  • Scattering Cross Sections
  • Temperature Gradients
  • Thermal Diffusion
  • Three Dimensional
  • Two Dimensional
  • United States

Readers

  • Materials Science and Engineering.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.