I was surprised to find out that the zero-point energy (ZPE) for the ground state of $\ce{BH3}$ is a few thousand $\pu{cm-1}$, because for molecules I usually work with, it's much smaller. Does anyone know the largest recorded ZPE?

I have recently asked a similar question: What is the biggest known difference between $r_e$ and $r_0$?

  • $\begingroup$ Liquid helium, maybe? $\endgroup$ Aug 30 '19 at 22:56
  • $\begingroup$ @OscarLanzi: Why liquid helium? $\endgroup$ Aug 30 '19 at 23:19
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    $\begingroup$ My understanding is this is what keeps it liquid to absolute zero unless compressed. $\endgroup$ Aug 30 '19 at 23:37
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    $\begingroup$ Is the question about vibrational zpe? see eg nist.gov/sites/default/files/documents/srd/jpcrd362007389p.pdf $\endgroup$
    – Buck Thorn
    Aug 31 '19 at 7:45
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    $\begingroup$ @buck of interest in your reference: Mg2 (which may form a weak bond if s-p mixing occurs in its MOs), NaLi (which may be considered a lithide). $\endgroup$ Aug 31 '19 at 12:10

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