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Helium-3 (3 He [1] [2] see also helion) is a light, stable isotope of helium with two protons and one neutron. (In contrast, the most common isotope, helium-4, has two protons and two neutrons.) Helium-3 and protium (ordinary hydrogen) are the only stable nuclides with more protons than neutrons. It was discovered in 1939.
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The three-atom combination of helium-4 atoms is an Efimov state. [1] [2] Helium-3 is predicted to form a trimer, although ground state dimers containing helium-3 are completely unstable. [3] Helium trimer molecules have been produced by expanding cold helium gas from a nozzle into a vacuum chamber.
A&E Records is a United Kingdom-based record label imprint, owned by Warner Music Group (WMG). It operates under the WEA International group of labels at WMG.. A&E Records was formalised in May 2003, when the NewsCorp Music Group of independent record labels (comprising Mushroom Records UK, Infectious Records, Ultimate Dilemma, Perfecto and 48K) were absorbed into WMG's East West after 20 ...
In Earth's atmosphere, the ratio of 3 He to 4 He is 1.343(13) × 10 −6. [5] However, the isotopic abundance of helium varies greatly depending on its origin. In the Local Interstellar Cloud, the proportion of 3 He to 4 He is 1.62(29) × 10 −4, [6] which is ~121 times higher than in Earth's atmosphere.
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Helium-3 nuclear magnetic resonance (3 He-NMR) is an analytical technique used to identify helium-containing compounds.Because a helium atom, or even two helium atoms, can be encased in fullerene-like cages, the nuclear magnetic resonance spectroscopy of this element can be a sensitive probe for changes of the carbon framework around it.
A helium-3 refrigerator is a simple device used in experimental physics for obtaining temperatures down to about 0.2 kelvins.By evaporative cooling of helium-4 (the more common isotope of helium), a 1-K pot liquefies a small amount of helium-3 in a small vessel called a helium-3 pot.