# Experimental bond lengths and binding energies of diatomic molecules

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?

• IMHO, Be2 and Ar2 hardly deserve to be called molecules. – Ivan Neretin Apr 23 '18 at 11:16
• 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... – thyme Apr 23 '18 at 11:18
• 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. – Tyberius Apr 23 '18 at 13:38