EXOTIC HELIUM ATOMS

2009 ◽  
Author(s):  
R. S. Hayano
Keyword(s):  
Helium Atoms

scholarly journals Helium Isotopes Quantum Sieving through Graphtriyne Membranes

Nanomaterials ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 73
Author(s):  
Marta I. Hernández ◽  
Massimiliano Bartolomei ◽  
José Campos-Martínez
Keyword(s):  
Low Temperatures ◽  
Quantum Tunneling ◽  
Transition State Theory ◽  
Selective Adsorption ◽  
State Theory ◽  
Helium Isotopes ◽  
Quantum Calculations ◽  
Approximate Methods ◽  
Helium Atoms ◽  
Quantum Behavior

We report accurate quantum calculations of the sieving of Helium atoms by two-dimensional (2D) graphtriyne layers with a new interaction potential. Thermal rate constants and permeances in an ample temperature range are computed and compared for both Helium isotopes. With a pore larger than graphdiyne, the most common member of the γ-graphyne family, it could be expected that the appearance of quantum effects were more limited. We find, however, a strong quantum behavior that can be attributed to the presence of selective adsorption resonances, with a pronounced effect in the low temperature regime. This effect leads to the appearance of some selectivity at very low temperatures and the possibility for the heavier isotope to cross the membrane more efficiently than the lighter, contrarily to what happened with graphdiyne membranes, where the sieving at low energy is predominantly ruled by quantum tunneling. The use of more approximate methods could be not advisable in these situations and prototypical transition state theory treatments might lead to large errors.

Monitoring damage of self-assembled monolayers using metastable excited helium atoms

2021 ◽  
Vol 154 (3) ◽  
pp. 034704
Author(s):  
Georgios Stratis ◽  
Jordan D. Zesch ◽  
Henry S. Pan ◽  
Lauren J. Webb ◽  
Mark G. Raizen
Keyword(s):  
Self Assembled Monolayers ◽  
Helium Atoms ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Excited Helium

Constructing accurate interaction potentials to describe the microsolvation of protonated methane by helium atoms

2017 ◽  
Vol 19 (12) ◽  
pp. 8307-8321 ◽  
Author(s):  
Dennis Kuchenbecker ◽  
Felix Uhl ◽  
Harald Forbert ◽  
Georg Jansen ◽  
Dominik Marx
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Ab Initio ◽  
Path Integral ◽  
Interaction Potential ◽  
Stationary Point ◽  
Path Integral Monte Carlo ◽  
Interaction Potentials ◽  
Helium Atoms

An ab initio-derived interaction potential is derived and used in path integral Monte Carlo simulations to investigate stationary-point structures of CH5+ microsolvated by up to four helium atoms.

Molecular Dynamics Simulation of the Displacement Cascades in Tungsten with Interstitial Helium Atoms

2014 ◽  
Vol 66 (1) ◽  
pp. 112-117 ◽  
Author(s):  
Xiaodan Yang ◽  
Huiqiu Deng ◽  
Nengwen Hu ◽  
Shifang Xiao ◽  
Cuilan Ren ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Dynamics Simulation ◽  
Helium Atoms ◽  
Displacement Cascades

Bubble growth from clustered hydrogen and helium atoms in tungsten under a fusion environment

2016 ◽  
Vol 57 (1) ◽  
pp. 016006 ◽  
Author(s):  
Yu-Wei You ◽  
Xiang-Shan Kong ◽  
Xuebang Wu ◽  
C.S. Liu ◽  
J.L. Chen ◽  
...  
Keyword(s):  
Bubble Growth ◽  
Helium Atoms

The interaction of metastable helium atoms with alkali atoms

1987 ◽  
Vol 5 (1) ◽  
pp. 9-20 ◽  
Author(s):  
M. -W. Ruf ◽  
A. J. Yencha ◽  
H. Hotop
Keyword(s):  
Metastable Helium ◽  
Helium Atoms ◽  
Alkali Atoms

scholarly journals Absolute cross sections for the dissociation of hydrogen cluster ions in high-energy collisions with helium atoms

2006 ◽  
Vol 73 (2) ◽  
Author(s):  
S. Eden ◽  
J. Tabet ◽  
K. Samraoui ◽  
S. Louc ◽  
B. Farizon ◽  
...  
Keyword(s):  
Cross Sections ◽  
High Energy ◽  
Cluster Ions ◽  
Helium Atoms ◽  
High Energy Collisions
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