On the orientational ordering in the quadrupolar glass phase of solid ortho-para hydrogen mixtures

1983 ◽  
Author(s):  
N. S. Sullivan
Keyword(s):  
Glass Phase ◽  
Para Hydrogen ◽  
Hydrogen Mixtures ◽  
Orientational Ordering ◽  
Quadrupolar Glass

Orientational ordering in solid hydrogen

1987 ◽  
Vol 65 (11) ◽  
pp. 1463-1470 ◽  
Author(s):  
N. S. Sullivan ◽  
C. M. Edwards ◽  
Y. Lin ◽  
D. Zhou
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Solid Hydrogen ◽  
Order Parameters ◽  
Para Hydrogen ◽  
Hydrogen Mixtures ◽  
Orientational Ordering ◽  
Nuclear Magnetic

The orientational ordering in solid ortho–para hydrogen mixtures is reviewed with emphasis on dilute mixtures for which a glass-like freezing of the randomly distributed quantum rotators is observed. The interpretation of the various nuclear magnetic resonance experiments used to monitor the relevant order parameters is discussed, and a summary is given of the current consensus and outstanding problems concerning the nature of the ordering in random dilute mixtures.

Orientational order–disorder transitions in solid hydrogen

1988 ◽  
Vol 66 (4) ◽  
pp. 908-914 ◽  
Author(s):  
N. S. Sullivan
Keyword(s):  
Orientational Order ◽  
Para Hydrogen ◽  
Local Ordering ◽  
Molecular Alignments ◽  
Hydrogen Mixtures ◽  
The Mean ◽  
Orientational Ordering ◽  
Quantum Rotors ◽  
Long Range Ordering ◽  
Continuous Freezing

We discuss the orientational ordering in solid ortho–para hydrogen mixtures. Following a brief sketch of the properties of the ortho and para hydrogen modifications and the long-range ordering of an assembly of J = 1 quantum rotors (ortho-H2), we consider the nature of the purely local ordering seen in random dilute ortho–para mixtures. Measurements of the quasi-static glass order parameter and the mean correlation time for the molecular alignments are interpreted in terms of a rapid but continuous freezing of the orientational fluctuations.

Calculation of the order parameter of solid hydrogen in the quadrupolar-glass phase

1994 ◽  
Vol 49 (14) ◽  
pp. 9460-9468 ◽  
Author(s):  
K. Walasek ◽  
K. Lukierska-Walasek
Keyword(s):  
Order Parameter ◽  
Glass Phase ◽  
Solid Hydrogen ◽  
Quadrupolar Glass

Solid H2: Has the quadrupolar glass phase a well-defined transition?

1980 ◽  
Vol 35 (8) ◽  
pp. 623-626 ◽  
Author(s):  
S. Washburn ◽  
R. Schweizer ◽  
H. Meyer
Keyword(s):  
Glass Phase ◽  
Quadrupolar Glass
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