The ortho-to-para conversion in solid hydrogen, catalyzed by hydrogen atoms

1994 ◽  
Vol 95 (5-6) ◽  
pp. 815-833 ◽  
Author(s):  
Valeri Shevtsov ◽  
Alexander Frolov ◽  
Igor Lukashevich ◽  
Eero Ylinen ◽  
Pekka Malmi ◽  
...  
Keyword(s):  
Solid Hydrogen ◽  
Hydrogen Atoms

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

Effect of initial energy of hydrogen atoms on reactions and trapping in solid hydrogen at 4 K

1983 ◽  
Vol 87 (9) ◽  
pp. 1611-1613 ◽  
Author(s):  
Tetsuo Miyazaki ◽  
Haruyuki Tsuruta ◽  
Kenji Fueki
Keyword(s):  
Initial Energy ◽  
Solid Hydrogen ◽  
Hydrogen Atoms

scholarly journals Dynamics of the structural transformation of crystalline hydrogen upon the transition into the conductive state under compression

2019 ◽  
Vol 485 (6) ◽  
pp. 676-681
Author(s):  
G. E. Norman ◽  
I. M. Saitov
Keyword(s):  
Electrical Conductivity ◽  
Structural Transformation ◽  
Density Functional ◽  
Pair Correlation ◽  
Solid Hydrogen ◽  
Unit Cell ◽  
Hydrogen Atoms ◽  
Hydrogen Molecules ◽  
The Density Functional Theory ◽  
Conductive State

The structural transformation of solid hydrogen under compression along the isotherm of 100 K in the region of transition into the conductive state was studied within the density functional theory. The pressure, the pair correlation function of protons, the density of electron states, and the electrical conductivity were calculated within a range of hydrogen densities from 1,14 to 2,11 g/cm3. The transition of the monoclinic structure of molecular solid hydrogen into the orthorhombic Cmca structure with 12 hydrogen atoms in a unit cell was revealed. In this case, the electrical conductivity was observed to grow, though hydrogen remained molecular. Hydrogen molecules decomposed under compression to the density of 1,563 g/cm3. A unit cell, the thus-formed quasi-tetrahedron, was built of five protons with a distance of 0,92 Å from the central proton to the four others.

HYDROGEN FORMATION IN γ-IRRADIATED HYDROGEN CHLORIDE

1962 ◽  
Vol 40 (7) ◽  
pp. 1385-1393 ◽  
Author(s):  
D. A. Armstrong
Keyword(s):  
Hydrogen Chloride ◽  
Solid Hydrogen ◽  
Pure Liquid ◽  
Hydrogen Yield ◽  
Hydrogen Atoms ◽  
A Value ◽  
Low Concentrations ◽  
Electronically Excited ◽  
Γ Rays ◽  
Electronically Excited Molecules

Hydrogen yields from pure liquid and solid hydrogen chloride irradiated with Co60 γ-rays were [Formula: see text](liquid) = 6.50 ± 0.10 and [Formula: see text] (solid) = 3.30 ± 0.10 at −79 °C and −196 °C respectively. The yield from solid hydrogen chloride was only slightly reduced by the addition of chlorine; but the yield from liquid samples was reduced sharply by low concentrations of chlorine to a value of about 4.5, and then much more gradually by larger concentrations. A [Formula: see text] value of 2.1 persisted at 10 mole% chlorine. The results were interpreted in terms of the formation of hydrogen in the reactions[Formula: see text]and[Formula: see text]Reduction of the hydrogen yields by chlorine was attributed to the reactions[Formula: see text]and[Formula: see text]Values of k11/k15 and k11*/k15* were estimated to be 1.7 × 10−3 and 0.10 respectively, while those of GH and GH(hot) were 2.4 ± 0.2 and 4.0 ± 0.2. Electron scavenging by chlorine was considered as a less likely mechanism for reduction of the hydrogen yield. Sources of the thermal and hot hydrogen atoms were examined and it was suggested that the decomposition of electronically excited molecules might be an important mode of decomposition.

The pressure effect on the recombination and relaxation of hydrogen atoms in solid hydrogen

2000 ◽  
Vol 319 (5-6) ◽  
pp. 535-541 ◽  
Author(s):  
Valeri Shevtsov ◽  
Takayuki Kumada ◽  
Yasuyuki Aratono ◽  
Tetsuo Miyazaki
Keyword(s):  
Pressure Effect ◽  
Solid Hydrogen ◽  
Hydrogen Atoms

Trapping sites of hydrogen atoms in solid hydrogen at 4.2 K analyzed by ESR linewidths

1991 ◽  
Vol 182 (1) ◽  
pp. 35-38 ◽  
Author(s):  
Tetsuo Miyazaki ◽  
Hiromichi Morikita ◽  
Kenji Fueki ◽  
Tatsuya Hiraku
Keyword(s):  
Solid Hydrogen ◽  
Hydrogen Atoms ◽  
Trapping Sites

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.

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