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Is it possible to find the experimental values of the bond length and the binding energy of the diatomic molecules $\text H_2$, $\text{Be}_2$, and $\text{Ar}_2$ in one source?

I found a lot of chemistry handbooks and databases, but non of the provided both, the bond length and the binding energy for all three molecules.

I guess the experienced chemists know some good sources?

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    $\begingroup$ IMHO, Be2 and Ar2 hardly deserve to be called molecules. $\endgroup$
    – Ivan Neretin
    Commented Apr 23, 2018 at 11:16
  • $\begingroup$ Yes, could be right, because the binding energy of Ar2 is about -12 meV and of Be2 about -100 meV. Meybe this is the reason why I can not find data... $\endgroup$
    – thyme
    Commented Apr 23, 2018 at 11:18
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    $\begingroup$ Might not have all the information you are looking for, but if it has an experimental (or computational) bond length, it will probably be here: cccbdb.nist.gov/diatomicexpbondx.asp. Diargon is no dice, but they actually do have a value for diberylium. $\endgroup$
    – Tyberius ♦
    Commented Apr 23, 2018 at 13:38

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