parahydrogen


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parahydrogen

[¦par·ə′hī·drə·jən]
(atomic physics)
Those states of hydrogen molecules in which the spins of the two nuclei are antiparallel; known as spin isomers.
References in periodicals archive ?
Research in this area will investigate properties of hydrogen-natural gas mixtures, various mixtures of orthohydrogen and parahydrogen, and the properties of hydrogen-methane mixtures pertaining primarily to storage, transmission and distribution applications.
Argon, ethylene, parahydrogen, nitrogen nitrogen trifluoride and oxygen.
New equations of state have been developed in the Master's Thesis of Jacob Leachman (4) for normal hydrogen, parahydrogen, and orthohydrogen; these equations will be fully documented elsewhere (5).
Leachman, Fundamental Equations of State for Parahydrogen, Normal Hydrogen, and Orthohydrogen, Master's Thesis, University of Idaho, Moscow (2007).
In parahydrogen, the spins of the two protons point in opposite directions.
Using the vector meson exchange model of the weak nucleon-nucleon interaction developed by DDH and a model dependent representation of the strong interaction, Avishai and Grange calculated the neutron spin rotation through a liquid parahydrogen target and obtained [3]
2], depending on the relative alignment of the proton spins: the spin 1 ortho-hydrogen and the spin 0 parahydrogen configurations.