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orthohydrogen

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orthohydrogen
orthohydrogen (stress variable) Also ortho hydrogen and with hyphen. [f. ortho- + hydrogen as tr. G. orthowasserstoff (Bonhoeffer & Harteck 1929, in Naturwissenschaften XVII. 182/1), coined on the analogy of orthohelium (see quot. 1935).] The form of molecular hydrogen in which the two nuclei in the... Oxford English Dictionary
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Liquid hydrogen
0.21% orthohydrogen. Parahydrogen, in which the two nuclear spins are antiparallel, is more stable than orthohydrogen, in which the two are parallel. wikipedia.org
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parahydrogen
parahydrogen (stress variable) Also para hydrogen and with hyphen. [f. para-1 3 + hydrogen, as tr. G. parawasserstoff (Bonhoeffer & Harteck 1929, in Naturwissenschaften XVII. 182/1), coined on the analogy of par(a)helium (see quot. 1935 s.v. orthohydrogen).] The form of molecular hydrogen in which t... Oxford English Dictionary
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Spin isomers of hydrogen
Parahydrogen is in a lower energy state than is orthohydrogen. This is the T = 0 intercept seen in the molar energy of orthohydrogen. wikipedia.org
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Karl-Friedrich Bonhoeffer
Research In 1929 Bonhoeffer, together with Paul Harteck, discovered the spin isomers of hydrogen, orthohydrogen and parahydrogen. wikipedia.org
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ortho-
ortho- before a vowel sometimes orth-, combining form of Gr. ὀρθός ‘straight, right’, an element of various words, chiefly scientific or technical, sometimes in the physical sense ‘straight’, sometimes in the ethical sense ‘right, correct, proper’. 1. In technical words generally (for the more impor... Oxford English Dictionary
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Isomer
long-lived states described as spin isomers or nuclear spin isomers: parahydrogen, with the spins of the two nuclei pointing in opposite directions, and orthohydrogen wikipedia.org
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Paul Harteck
Physical Chemistry and Elektrochemistry) located in Dahlem-Berlin, where he worked with Karl Friedrich Bonhoeffer on experiments on parahydrogen and orthohydrogen wikipedia.org
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Grand canonical ensemble
potentials) in the conduction band and valence band; (spintronics) distinct spin-up and spin-down chemical potentials; (cryogenics) distinct parahydrogen and orthohydrogen wikipedia.org
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Project Rover
Alternatively, there are two spin isomers of hydrogen: parahydrogen is a neutron moderator but orthohydrogen is a poison, and perhaps the high neutron flux had changed some of the parahydrogen to orthohydrogen. wikipedia.org
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