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orthohelium

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orthohelium
orthohelium (stress variable) [f. ortho- + helium, as an antonym of the earlier par(a)helium.] The form of helium whose spectrum exhibits a fine structure of triplets owing to the spins of the two orbital electrons being parallel.1922 A. D. Udden tr. Bohr's Theory of Spectra iii. iii. 86 Helium was ... Oxford English Dictionary
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parahelium
parahelium (stress variable) Also parhelium. [f. para-1 3 + helium.] The form of helium whose spectrum does not exhibit the fine structure of orthohelium, owing to the spins of the two orbital electrons being anti-parallel.1896 Runge & Paschen in Astrophysical Jrnl. III. 18 We come to the conclusion... Oxford English Dictionary
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Helium atom
electrons) requires antisymmetry under simultaneous exchange of spin and coordinates Parahelium is then the singlet state with a symmetric function and orthohelium This explains the absence of the state (with ) for orthohelium, where consequently (with ) is the metastable ground state. wikipedia.org
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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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metastable
metastable, a. (mɛtəˈsteɪb(ə)l) [Irreg. f. meta- + stable a., as tr. of G. metastabil (coined in sense 1 by W. Ostwald, in Lehrb. d. allgemeinen Chem. (1893) II. i. 517).] 1. Of a physical system: persisting (in its existing state) when undisturbed or subject to disturbances smaller than some small ... Oxford English Dictionary
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