Communication: Test of quantum chemistry in vibrationally hot hydrogen molecules

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Precision measurements are performed on highly excited vibrational quantum states of molecular hydrogen. The v = 12, J = 0 - 3 rovibrational levels of H<inf>2</inf> (X 1 Σ g +), lying only 2000 cm-1 below the first dissociation limit, were populated by photodissociation of H<inf>2</inf>S and their level energies were accurately determined by two-photon Doppler-free spectroscopy. A comparison between the experimental results on v = 12 level energies with the best ab initio calculations shows a good agreement, where the present experimental accuracy of 3.5 × 10-3 cm-1 is more precise than theory, hence providing a gateway to further test theoretical advances in this benchmark quantum system.
Original languageEnglish
Article number081102
Pages (from-to)081102
JournalJournal of Chemical Physics
Issue number8
Publication statusPublished - 2015


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