scholarly journals Pressure dependence of the roton spectrum in liquid helium

1974 ◽  
Vol 15 (5-6) ◽  
pp. 473-479 ◽  
Author(s):  
David L. Bartley ◽  
John E. Robinson ◽  
Chia-Wei Woo
Keyword(s):  
Liquid Helium ◽  
Pressure Dependence

scholarly journals Pressure Dependence of Second Sound Velocity in Liquid Helium. II

1951 ◽  
Vol 81 (3) ◽  
pp. 444-447 ◽  
Author(s):  
R. D. Maurer ◽  
Melvin A. Herlin
Keyword(s):  
Sound Velocity ◽  
Liquid Helium ◽  
Pressure Dependence ◽  
Second Sound ◽  
Helium Ii

Pressure dependence of elementary excitations in normal liquid helium-3

1987 ◽  
Vol 59 (2) ◽  
pp. 217-220 ◽  
Author(s):  
R. Scherm ◽  
K. Guckelsberger ◽  
B. Fak ◽  
K. Sköld ◽  
A. J. Dianoux ◽  
...  
Keyword(s):  
Liquid Helium ◽  
Pressure Dependence ◽  
Elementary Excitations ◽  
Normal Liquid ◽  
Helium 3

Pressure dependence of orthopositronium lifetime and bubble parameters in liquid helium

1976 ◽  
Vol 57 (2) ◽  
pp. 175-176 ◽  
Author(s):  
P Hautojärvi ◽  
K Rytsölä ◽  
P Tuovinen ◽  
P Jauho
Keyword(s):  
Liquid Helium ◽  
Pressure Dependence

A Superconducting Microscope

1971 ◽  
Vol 29 ◽  
pp. 10-11 ◽  
Author(s):  
R. E. Worsham ◽  
J. E. Mann ◽  
E. G. Richardson
Keyword(s):  
Liquid Helium ◽  
Focal Length ◽  
Vacuum System ◽  
Objective Lens ◽  
Electrical Instability ◽  
Radiation Shields ◽  
And Control ◽  
Thermal Oscillations ◽  
Flux Pump

This superconducting microscope, Figure 1, was first operated in May, 1970. The column, which started life as a Siemens Elmiskop I, was modified by removing the objective and intermediate lenses, the specimen chamber, and the complete vacuum system. The large cryostat contains the objective lens and stage. They are attached to the bottom of the 7-liter helium vessel and are surrounded by two vapor-cooled radiation shields.In the initial operational period 5-mm and 2-mm focal length objective lens pole pieces were used giving magnification up to 45000X. Without a stigmator and precision ground pole pieces, a resolution of about 50-100Å was achieved. The boil-off rate of the liquid helium was reduced to 0.2-0.3ℓ/hour after elimination of thermal oscillations in the cryostat. The calculated boil-off was 0.2ℓ/hour. No effect caused by mechanical or electrical instability was found. Both 4.2°K and 1.7-1.9°K operation were routine. Flux pump excitation and control of the lens were quite smooth, simple, and, apparently highly stable. Alignment of the objective lens proved quite awkward, however, with the long-thin epoxy glass posts used for supporting the lens.

Water accumulation as a function of temperature on specimens in an electron microscope cold stage

1986 ◽  
Vol 44 ◽  
pp. 114-115 ◽  
Author(s):  
M.K. Lamvik ◽  
D.A. Kopf ◽  
S.D. Davilla ◽  
J.D. Robertson
Keyword(s):  
Electron Microscope ◽  
Mass Loss ◽  
Liquid Helium ◽  
Liquid Nitrogen ◽  
Liquid Nitrogen Temperature ◽  
Liquid Helium Temperature ◽  
Helium Temperature ◽  
Cold Stage ◽  
Water Accumulation ◽  
Better Than

Last year we reported1 that there is a striking reduction in the rate of mass loss when a specimen is observed at liquid helium temperature. It is important to determine whether liquid helium temperature is significantly better than liquid nitrogen temperature. This requires a good understanding of mass loss effects in cold stages around 100K.

On the pressure dependence of the thermodynamical scaling exponent γ

Soft Matter ◽  
2020 ◽  
Vol 16 (19) ◽  
pp. 4625-4631 ◽  
Author(s):  
R. Casalini ◽  
T. C. Ransom
Keyword(s):  
Pressure Dependence ◽  
Scaling Exponent ◽  
Scaling Parameter

In materials with a constant scaling parameter γS, the Isomorph γI is found to vary with pressure, demonstrating γS ≠ γI.

PRESSURE DEPENDENCE OF THE SUPERFLUID DENSITY IN 3He-B

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-37-C6-38 ◽  
Author(s):  
C. N. Archie ◽  
T. A. Alvesalo ◽  
J. E. Bethold ◽  
J. D. Reppy ◽  
R. C. Richardson
Keyword(s):  
Pressure Dependence ◽  
Superfluid Density

PRESSURE DEPENDENCE OF PHONON LINESHAPES OF SOLlD DEUTERIUM IN THE ORDERED STATE

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-97-C6-98
Author(s):  
R. Jochemsen ◽  
V. V. Goldman ◽  
Isaac F. Silvera
Keyword(s):  
Pressure Dependence ◽  
Ordered State
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