Comparison of Platinum—Rhodium Resistance Thermometers with the Helium Gas Thermometer from 11 to 300°K. An Improved Cryostat. Low Temperature Studies, No. 2

1937 ◽  
Vol 59 (10) ◽  
pp. 1962-1965 ◽  
Author(s):  
R. W. Blue ◽  
J. F. G. Hicks
Keyword(s):  
Low Temperature ◽  
Resistance Thermometers ◽  
Helium Gas

scholarly journals The role of spin–orbit effects in the mobility of N+ ions moving in a helium gas at low temperature

2020 ◽  
Vol 74 (7) ◽  
Author(s):  
Lamia Aïssaoui ◽  
Peter J. Knowles ◽  
Moncef Bouledroua
Keyword(s):  
Low Temperature ◽  
Cross Sections ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Temperature Model ◽  
Helium Gas ◽  
Spin Orbit Interactions ◽  
High Level

Abstract The mobility of N+ ions in ground-state helium gas at very low temperature is examined with explicit inclusion of spin–orbit coupling effects. The ionic kinetics is treated theoretically with the three-temperature model. The N+–He interaction potentials, including spin–orbit coupling, are determined using high-level ab initio calculations. Then, the classical and quantal transport cross sections, both needed in the computation of the mobility coefficients, are calculated in terms of the collisional energy of the N+–He system. The numerical results, at temperature 4.3 K, show the spin–orbit interactions have negligible effect on the mobility coefficients. Graphical abstract

THE CALIBRATION OF PLATINUM RESISTANCE THERMOMETERS IN THE TEMPERATURE RANGE 11° TO 90°K

1951 ◽  
Vol 29 (2) ◽  
pp. 142-150 ◽  
Author(s):  
J. M. Los ◽  
J. A. Morrison
Keyword(s):  
Low Temperature ◽  
Temperature Scale ◽  
Platinum Resistance ◽  
National Bureau ◽  
International Temperature Scale ◽  
International Temperature ◽  
Platinum Resistance Thermometers ◽  
Resistance Thermometers ◽  
Corrective Term ◽  
Low Temperature Calorimetry

A set of six platinum resistance thermometers of a form suitable for low temperature calorimetry has been made and calibrated in the region 11° to 90°K. by intercomparison with a similar thermometer which had been calibrated at the National Bureau of Standards. Above 90°K. calibration has been made on the International Temperature Scale.Using the intercomparison data, it has been possible to derive a method whereby for these thermometers the scale for the region 20° to 90°K. may be found to within 0.002°C. by means of fixed points. The method applies a 'Z function' of the type used at the National Bureau of Standards (13), plus a corrective term which depends upon the resistance of the thermometer at the boiling point of hydrogen and upon the normal constants which are determined for the International Temperature Scale above 90°K.

scholarly journals Channel electron bubbles in low-temperature helium gas

2018 ◽  
Vol 44 (10) ◽  
pp. 1077-1084
Author(s):  
Yu. P. Monarkha
Keyword(s):  
Low Temperature ◽  
Electron Bubbles ◽  
Helium Gas
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