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 Title: PRECISION SPECTROSCOPY ON HIGHLY-EXCITED VIBRATIONAL LEVELS OF H2 Author(s): Salumbides, Edcel John Contributor(s): Ubachs, Wim; Niu, Ming Li Subject(s): Mini-symposium: High-Precision Spectroscopy Abstract: The ground electronic energy levels of H$_2$ have been used as a benchmark system for the most precise comparisons between emph{ab initio} calculations and experimental investigations. Recent examples include the determinations of the ionization energy [1], fundamental vibrational energy splitting [2], and rotational energy progression extending to $J=16$ [3]. In general, the experimental and theoretical values are in excellent agreement with each other. The energy calculations, however, reduce in accuracy with the increase in rotational and vibrational excitation, limited by the accuracy of non-Born Oppenheimer corrections, as well as the higher-order QED effects. While on the experimental side, it remains difficult to sufficiently populate these excited levels in the ground electronic state. We present here our high-resolution spectroscopic study on the X $^1Sigma^+_g$ electronic ground state levels with very high vibrational quanta ($nu=10,11,12$). Vibrationally-excited H$_2$ are produced from the photodissociation of H$_2$S [4], and subsequently probed by a narrowband pulsed dye laser system. The experimental results are consistent with and more accurate than the best theoretical values [5]. These vibrationally-excited level energies are also of interest to studies that extract constraints on the possible new interactions that extend beyond the Standard Model [6]. [1] J. Liu et al., J. Chem. Phys. 130, 174306 (2009). [2] G. Dickenson et al., Phys. Rev. Lett. 110, 193601 (2013). [3] E.J. Salumbides et al., Phys. Rev. Lett. 107, 143005 (2011). [4] J. Steadman and T. Baer, J. Chem. Phys. 91, 6113 (1989). [5] J. Komasa et al., J. Chem. Theory Comp. 7, 3105 (2011). [6] E.J. Salumbides et al., Phys. Rev. D 87, 112008 (2013). Issue Date: 22-Jun-15 Publisher: International Symposium on Molecular Spectroscopy Citation Info: ACS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/79312 Date Available in IDEALS: 2016-01-05
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