Accession Number:

ADA210565

Title:

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

Descriptive Note:

Technical rept.

Corporate Author:

STATE UNIV OF NEW YORK AT BUFFALO DEPT OF CHEMISTRY

Personal Author(s):

• Um, C. I.
• Jun, C. W.
• Shin, H. J.
• George, Thomas F.

Report Date:

1989-07-01

Pagination or Media Count:

28.0

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.

Descriptors:

• *LIQUID HELIUM
• *ROTONS
• VARIATIONS
• THREE DIMENSIONAL
• CONSTANTS
• PHONONS
• RANGE(EXTREMES)
• SCATTERING
• RATIOS
• THERMAL DIFFUSION

Subject Categories:

• Quantum Theory and Relativity
• Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE