Talk:Helium dimer
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 | A fact from Helium dimer appeared on Wikipedia's Main Page in the Did you know column on 23 February 2015 (check views). The text of the entry was as follows:
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Helium-3 Dimers
It appears that Helium-3 can form dimers: http://www.sciencedirect.com/science/article/pii/S0921452699026824 Can somebody verify that my reading of the article was correct?
If so, it contradicts the formation section. 192.12.88.232 (talk) 18:36, 22 April 2015 (UTC)
- In this case the situation is more complex than just two 3He atoms. They are surrounded by 4He atoms, and are somehow confined to a 2D skin, which probably means that they are also weakly bound to another surface. It is probably worth a mention in the article though. You are welcome to add something to the article. The article also mentions trapping two 3He atoms in a fullerene cage. This would correspond to a high pressure. Other unusual situations where they can be bound would be in an extremely strong magnetic field (eg on a neutron star) or high energy UV flux. I did not include these last two yet as not adequately supported by secondary sources. Graeme Bartlett (talk) 21:42, 22 April 2015 (UTC)
Bond length
It is currently written that "the He2 molecule has a large separation distance between the atoms of about 5200 pm." However, the equilibrium distance is known (see for instance J. Chem. Phys. 132, 204304 (2010)) to be 5.6 bohrs = 2.97 Angströms = 2970 pm. — Preceding unsigned comment added by 193.52.161.169 (talk) 08:39, 22 June 2017 (UTC)
- I assume you mean http://dx.doi.org/10.1063/1.3432250 or https://arxiv.org/pdf/1001.3268. This is a theoretical calculation. (Actually there are numerous calculations of this, and it is often a test of molecular bonding algorithms to see if they can come up with a sensible result.) The figure I put in the article is a measured result. Graeme Bartlett (talk) 11:25, 22 June 2017 (UTC)
- The value in the Monte Carlo article is the equilibrium bond length, not the vibrationally averaged one. They don't seem to include any sorts of nuclear dynamics in their study, only electronic structure. So not only a calculated results, but apples and oranges. 174.3.181.76 (talk) 15:59, 13 May 2018 (UTC)
How about He+
He−
?
Because the first He would be H-like, and the other lithium-like. Alfa-ketosav (talk) 07:21, 3 December 2018 (UTC)
- If it was discovered it would be a very short lived excimer. Though I cannot find any studies of this. Graeme Bartlett (talk) 22:41, 3 December 2018 (UTC)