scholarly journals Collision-Induced Spin Flip of Hydrogen Atoms

1959 ◽  
Vol 115 (4) ◽  
pp. 911-918 ◽  
Author(s):  
Oldwig von Roos
Keyword(s):  
Hydrogen Atoms ◽  
Spin Flip

Observation of ESR spin flip satellite lines of trapped hydrogen atoms in solid hydrogen at 4.2 K

1990 ◽  
Vol 94 (4) ◽  
pp. 1702-1705 ◽  
Author(s):  
Tetsuo. Miyazaki ◽  
Nobuchika. Iwata ◽  
Kenji. Fueki ◽  
Hirotomo. Hase
Keyword(s):  
Solid Hydrogen ◽  
Hydrogen Atoms ◽  
Spin Flip

scholarly journals Testing fundamental physics with photon frequency shift

2020 ◽  
Vol 80 (2) ◽  
Author(s):  
Luca Buoninfante ◽  
Gaetano Lambiase ◽  
Antonio Stabile
Keyword(s):  
General Relativity ◽  
Excited State ◽  
Frequency Shift ◽  
New Physics ◽  
Electron Spins ◽  
Hydrogen Atoms ◽  
Spin Flip ◽  
Extended Theories Of Gravity ◽  
Theories Of Gravity ◽  
Extended Theories

Abstract We propose a high precision satellite experiment to further test Einstein’s General Relativity and constrain extended theories of gravity. We consider the frequency shift of a photon radially exchanged between two observers located on Earth and on a satellite in circular orbit in the equatorial plane. In General Relativity there exists a peculiar satellite-distance at which the static contribution to the frequency shift vanishes since the effects induced by pure gravity and special relativity compensate, while it can be non-zero in modified gravities, like in models with screening mechanisms. As an experimental device placed on the satellite we choose a system of hydrogen atoms which can exhibit the 1 s spin-flip transition from the singlet (unaligned proton-electron spins) to the triplet (aligned proton-electron spins) state induced by the absorption of photons at 21.1 cm. The observation of an excited state would indicate that the frequency of the emitted and absorbed photon remains unchanged according to General Relativity. On the contrary, a non-zero frequency shift, as predicted in extended theories of gravity, would prevent the spin-flip transition and the hydrogen atoms from jumping into the excited state. Such a detection would signify a smoking-gun signature of new physics beyond special and general relativity.

Remarks on the diffuse interstellar lines

1967 ◽  
Vol 31 ◽  
pp. 91-93 ◽  
Author(s):  
G. Herzberg
Keyword(s):  
Hydrogen Atoms ◽  
Interstellar Gas

It is suggested that the diffuse interstellar lines are produced in the interstellar gas by molecules consisting of a few hydrogen atoms and one other atom, such as CH4+ or NH4. Diffuseness of the lines is assumed to result from predissociation of these molecules.

SURFACE PLASMA SOURCE OF HYDROGEN ATOMS WITH AN ENERGY OF HUNDREDS eV

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-479-C7-480 ◽  
Author(s):  
V. G. Dudnikov ◽  
G. I. Fiksel'
Keyword(s):  
Plasma Source ◽  
Surface Plasma ◽  
Hydrogen Atoms

H NMR Evidence for a Change in The Local Hydrogen Environment of Sites Associated with the Staebler-Wronski Effect in a-Si:H

2002 ◽  
Vol 715 ◽  
Author(s):  
T. Su ◽  
Robin Plachy ◽  
P. C. Taylor ◽  
S. Stone ◽  
G. Ganguly ◽  
...  
Keyword(s):  
Line Shape ◽  
Defect Density ◽  
Hydrogen Atoms ◽  
Hydrogen Environment ◽  
H Nmr ◽  
Line Shapes ◽  
Different Temperatures ◽  
Staebler Wronski Effect

AbstractWe study the H NMR line shapes of a sample of a-Si:H under several conditions: 1) as grown, 2) light-soaked for 600 hours, and 3) light-soaked followed by annealing at different temperatures. At T = 7 K, the NMR line shape of the sample after light soaking exhibits an additional doublet compared to that of the sample as-grown. This doublet is an indication of a closely separated hydrogen pair. The distance between the two hydrogen atoms is estimated to be about (2.3 ± 0.2) Å. The concentration of these hydrogen sites is estimated to be between 1017 and 1018 cm-3 consistent with ESR measurements of the defect density after light soaking. This doublet disappears after the sample is annealed at 200°C for 4 hours.

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