Photolysis Production And Precision Measurement Of The Highest Vibrational States (v=14) And Quasi-bound Resonances In X¹Σ_g⁺ H₂

Lai, Kin Fung

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https://hdl.handle.net/2142/111227 Copy

Description

Title

Photolysis Production And Precision Measurement Of The Highest Vibrational States (v=14) And Quasi-bound Resonances In X¹Σ_g⁺ H₂

Author(s)

Lai, Kin Fung

Contributor(s)

• Ubachs, Wim
• Salumbides, Edcel John
• Beyer, Maximilian

Issue Date

2021-06-23

Keyword(s)

Mini-symposium: Precision Spectroscopy for Fundamental Physics

Abstract

Highly excited rovibrational states of H$_2$ in the X $^{1}\Sigma_{g}^{+}$ electronic ground state are prepared by two-photon photolysis of H$_2$S [1]. The highest vibrational levels $v=14, J=0-4$, with a dissociation energy of less than 100 cm$^{-1}$, and some long-lived quasi-bound resonances ($v,J$) = (7,21), (8,19), (9,17), and (10,15) are probed through Doppler-free two-photon spectroscopy of F $^{1}\Sigma_{g}^{+}$ - X $^{1}\Sigma_{g}^{+}$ transitions. By compensating AC-Stark shifts, absolute transition frequencies were determined with an accuracy on the order of 90 MHz. From combination differences of the F-X transitions the energy level splittings in the electronic ground state are determined and compared with \emph{ab initio} calculations, including relativistic and QED effects. This study extends precision test of QED theory for the electronic ground state of the hydrogen molecule to the very highest bound level, and into the quasi-bound region. [1] K.-F. Lai, M. Beyer, E.J.Salumbides, W. Ubachs, Photolysis production and spectroscopic investigation of the highest vibrational states in H2 ($X^{1}\Sigma_{g}^{+}$ $v=13,14$), J. Phys. Chem. A 125, 1221-1228 (2021)

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Permalink

http://hdl.handle.net/2142/111227

DOI

10.15278/isms.2021.WI04

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