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What are parahelium and orthohelium? - Physics Stack Exchange
Parahelium is different because the lower energy state allowed is the 1s orbital, which has an associated orbital harmonic function which is symmetric. physics.stackexchange.com
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Orthohelium and Parahelium - Richard Fitzpatrick
Helium in the spin-singlet state is known as parahelium, whereas helium in the triplet state is called orthohelium. farside.ph.utexas.edu
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Helium atom - Wikipedia
Hence parahelium can also be said to be the spin anti-symmetric state (singlet state) or orthohelium to be spin symmetric state (triplet state). The ... en.wikipedia.org
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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 Energy Levels - HyperPhysics
An electron in an upper state can have spin antiparallel to the ground state electron (S=0, singlet state, parahelium) or parallel to the ground state electron ... hyperphysics.phy-astr.gsu.edu
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parahelium - Wiktionary, the free dictionary
parahelium (uncountable). (physics) The form of the helium atom in which the spins of the two electrons form a singlet state (a state with zero total spin) ... en.wiktionary.org
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Helium atom
through the Pauli exclusion principle, which for fermions (like electrons) requires antisymmetry under simultaneous exchange of spin and coordinates Parahelium two arbitrary (orthogonal and normalized) one-electron eigenfunctions : or for the special cases of (both electrons have identical quantum numbers, parahelium wikipedia.org
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[PDF] Helium atom - parahelium and orthohelium - Physics Pages
States with an antisymmetric spin function are known as parahelium, and states with a symmetric spin function are known as orthohelium. Since ... physicspages.com
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[PDF] Quantum Mechanics and Atomic Physics
This gives us two sets of states for Helium: 1. Parahelium: ▫ electrons have antiparallel spins, s'=0 ... www.physics.rutgers.edu
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The Helium atom
... parahelium. Coulomb repulsion between the electrons results in the triplet states being lower in energy than the corresponding singlets. This is explained ... theory.physics.manchester.ac.uk
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Para & Ortho Helium (Spin Isomers) | Quantum Mechanics - YouTube
... para-helium and ortho-helium. Para-helium was the name for the lower energy states and ortho-helium was assigned to the higher energy ... www.youtube.com
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parhelium
parhelium obs. var. parhelion, var. parahelium. Oxford English Dictionary
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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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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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