University of Illinois Urbana-Champaign

PRECISION SPECTROSCOPY ON HIGHLY-EXCITED VIBRATIONAL LEVELS OF H2

Salumbides, Edcel John

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450676.pdf

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https://hdl.handle.net/2142/79312

Description

Title
PRECISION SPECTROSCOPY ON HIGHLY-EXCITED VIBRATIONAL LEVELS OF H2
Author(s)
Salumbides, Edcel John
Contributor(s)
  • Ubachs, Wim
  • Niu, Ming Li
Issue Date
22-Jun-15
Keyword(s)
Mini-symposium: High-Precision Spectroscopy
Date of Ingest
2016-01-05T20:03:01Z
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).
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
text
Genre of Resource
Conference Paper / Presentation
Language
English
Permalink
http://hdl.handle.net/2142/79312

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Abstracts & Presentations - 2015 International Symposium on Molecular Spectroscopy PRIMARY