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dihelium

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Origin: China

Cas No: 12184-98-4

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CAS No.: 12184-98-4 Formula: He2 Molecular Weight: 8.00520

Description
The helium dimer is a van der Waals molecule with formula He2 consisting of two helium atoms. This molecule is the largest with two atoms, and is only very weakly bound together. The bond is so weak that it will break if the molecule rotates, or vibrates too much. It can only exist at very low cryogenic temperatures.
Two excited helium atoms can also bond to each other in a form called an excimer. This was discovered from a spectrum of helium that contained bands first seen in 1912. Written as He2* with the * meaning an excited state, it is the first known Rydberg molecule.
Dihelium ions also exist with a negative, positive and double positive charge. Two helium atoms can be confined together without bonding in the cage of a fullerene.

Basic Info

Chemical Name dihelium

Synonyms

CAS No. 12184-98-4

Molecular Formula He2

Molecular Weight 8.00520

PSA 0.00000

LogP 0.00000

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