Atomic hydrogen-deuterium mixtures at 1 kelvin: Recombination rates, spin-exchange cross sections, and solvation energies

1995 ◽  
Vol 99 (5-6) ◽  
pp. 787-849 ◽  
Author(s):  
M. E. Hayden ◽  
W. N. Hardy
Keyword(s):  
Cross Sections ◽  
Atomic Hydrogen ◽  
Spin Exchange ◽  
Recombination Rates ◽  
Solvation Energies ◽  
Hydrogen Deuterium

Spin-exchange scattering cross sections for hydrogen atoms at low temperatures

1980 ◽  
Vol 58 (6) ◽  
pp. 881-885 ◽  
Author(s):  
A. J. Berlinsky ◽  
B. Shizgal
Keyword(s):  
Cross Sections ◽  
Low Temperatures ◽  
Atomic Hydrogen ◽  
Spin Exchange ◽  
Low Energy ◽  
Energy Limit ◽  
Hydrogen Atoms ◽  
Exchange Scattering ◽  
Scattering Cross Sections

Calculations are presented of the low energy (0 < E ≤ 10−2 eV) spin exchange and frequency shift cross sections for (H,H) scattering, and of their thermal averages for 0 < T < 10 K. In particular, the behaviour of the cross sections in this low energy limit and the role of resonances due to orbiting collisions is studied in detail. A comparison is made with recent nmr measurements on gaseous atomic hydrogen at liquid helium temperatures. The results of this work suggest further useful experiments at low temperatures.

Classical and semiclassical description of initial distributions of kaon capture by atomic hydrogen and deuterium

2013 ◽  
Vol 91 (3) ◽  
pp. 273-278 ◽  
Author(s):  
Rashid Riahi ◽  
Morteza Raeisi
Keyword(s):  
Cross Sections ◽  
Atomic Hydrogen ◽  
Classical Trajectory ◽  
Kaonic Hydrogen ◽  
Kaonic Atom ◽  
Large N ◽  
Hydrogen Deuterium ◽  
Classical Trajectory Monte Carlo ◽  
Initial Distributions ◽  
Capture Cross Sections

The moderation and capture of negative kaons by atomic hydrogen and deuterium were investigated by the classical trajectory Monte–Carlo (CTMC) and the semiclassical fermion molecular dynamics (FMD) methods. The dependence of ionization and capture cross sections on initial kaon energy was also studied. The initial populations of kaonic atom levels were calculated. The n distributions of kaonic atoms peaked close to the orbital giving optimum overlap with the displaced electronic orbital. The angular momentum distributions, l, are found to be approximately statistical but cut off at large l smaller than lmax = n − 1 in large n. The results are compared with the adiabatic ionization, diabatic states, and Born approximation methods. The FMD results were found to be in better agreement with quantum mechanical calculations than the ones from CTMC. The kaon kinetic energy spectrum prior to capture was calculated, which reveals that capture occurs at small collision energies up to the ionization energy. Also, the calculations show that kaonic hydrogen (deuterium) atoms have kinetic energies below 0.3 a.u. (0.15 a.u.) after formation.

Emission cross sections for fully stripped carbon colliding with atomic hydrogen

1988 ◽  
Vol 8 (1) ◽  
pp. 57-61 ◽  
Author(s):  
R. Hoekstra ◽  
D. Ćirić ◽  
A. N. Zinoviev ◽  
Yu. S. Gordeev ◽  
F. J. Heer ◽  
...  
Keyword(s):  
Cross Sections ◽  
Atomic Hydrogen

Further investigations of charge exchange and electron detachment - I. Ion energies 3 to 40 keV - II. Ion energies 100 to 4000 eV

1955 ◽  
Vol 227 (1171) ◽  
pp. 466-486 ◽  
Keyword(s):  
Charge Transfer ◽  
Energy Range ◽  
Cross Sections ◽  
Atomic Hydrogen ◽  
Molecular Hydrogen ◽  
Hydrogen Ions ◽  
Electron Detachment ◽  
Rare Gases ◽  
Helium Ions ◽  
Ion Energies

This paper describes the measurement of charge transfer cross-sections for protons, molecular hydrogen ions and helium ions in the rare gases and hydrogen, and electron detachment cross-sections for negative atomic hydrogen ions in the rare gases. Part I describes the energy range 3 to 40 keV. In part II the energy range 100 to 4000 eV is described, and the results are discussed in terms of the pseudo-adiabatic hypothesis. Comparisons are made with other experimental results, and anomalous molecular cases are discussed in terms of reactions involving anti-bonding states.

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