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Communication: Test of quantum chemistry in vibrationally hot hydrogen molecules
25.J. Liu, E. J. Salumbides, U. Hollenstein, J. C. J. Koelemeij, K. S. E. Eikema, W. Ubachs, and F. Merkt, J. Chem. Phys. 130, 174306 (2009).
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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 H2 (
), lying only 2000 cm−1 below the first dissociation limit, were populated by photodissociation of H2S 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.
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