PRECISION SPECTROSCOPY ON HIGHLY-EXCITED VIBRATIONAL LEVELS OF H2

Salumbides, Edcel John

Permalink

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

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

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

Language

English

Permalink

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

Owning Collections