Mobility of Electrons in Low-Temperature Helium Gas

1967 ◽  
Vol 154 (1) ◽  
pp. 138-149 ◽  
Author(s):  
James L. Levine ◽  
T. M. Sanders
Keyword(s):  
Low Temperature ◽  
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

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

scholarly journals Thermoelastohydrodynamic Characteristics of Low-Temperature Helium Gas T-Groove Face Seals

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2873
Author(s):  
Delei Zhu ◽  
Jing Yang ◽  
Shaoxian Bai
Keyword(s):  
High Pressure ◽  
Low Temperature ◽  
Rate Increase ◽  
Leakage Rate ◽  
Monotonic Trend ◽  
Rotating Speed ◽  
Sealing Performance ◽  
Helium Gas ◽  
Face Seals ◽  
Compressibility Coefficient

Thermoelastohydrodynamic lubrication behaviors of helium gas T-groove face seals are numerically simulated under conditions of low temperature and high pressure, with the consideration of real-gas properties including compressibility coefficient, viscosity, and heat capacity. It is found that helium gas T-groove face seal presents a sharp divergent deformation at low temperature and high pressure, which makes the opening performance weaken and the leakage rate increase. This result is obviously different from the case of high-temperature gas face seals. As the sealing temperature drops from 300 K to 150 K, the leakage rate increases about 17% and the opening force decreases about 15%. Moreover, with the growth of rotational speed, both the outlet film pressure and the sealing performance present a non-monotonic trend. Specifically, while the rotating speed of moving ring raises from 3000 to 30,000 r·min−1, the leakage rate changes more than 30%, and the opening force is reduced about 10%.

scholarly journals State-selective ion mobility measurement for NHn+(n= 1 - 3) ions in helium gas at low temperature

2015 ◽  
Vol 635 (3) ◽  
pp. 032070
Author(s):  
K Mori ◽  
H Maki ◽  
A Ninomiya ◽  
R Isawa ◽  
H Tanuma
Keyword(s):  
Low Temperature ◽  
Ion Mobility ◽  
Helium Gas ◽  
Mobility Measurement

Positron Lifetimes in Low-Temperature Helium Gas

1965 ◽  
Vol 15 (19) ◽  
pp. 746-748 ◽  
Author(s):  
L. O. Roellig ◽  
T. M. Kelly
Keyword(s):  
Low Temperature ◽  
Helium Gas ◽  
Positron Lifetimes
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