orthohelium

orthohelium

[¦ȯr·thō′hē·lē·əm]
(atomic physics)
Those states of helium atoms in which the spins of the two electrons are parallel.
References in periodicals archive ?
Rhino Correct is made of orthohelium and easily fits all nose shapes.
Interestingly, the line emissions from the triplet states of orthohelium can be quite strong on the limb of the Sun.
As for the excited orthohelium, it is unable to relax, as its two electrons have the same spin (either both spin up or both spin down).
Importantly, since excited orthohelium cannot fully relax back to the ground state, it remains available to recondense with atomic hydrogen in the chromosphere.
Helium in this case is known as orthohelium (or triplet state helium), emphasizing that its two electrons have spins with the same orientation.
Since orthohelium is trapped in the excited triplet state, it has an opportunity to once again react with hydrogen, as displayed in the lower portion of Fig.
1, once the doubly excited helium atom has partially relaxed to regenerate orthohelium, it can react once again with atomic hydrogen, leading to the renewed synthesis of excited helium hydride, HeH*.