University of Illinois Urbana-Champaign

Improvement of the dissociation energy of the hydrogen molecule (Part one)

Hussels, Joël

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1107606.pdf
3018.pdf

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https://hdl.handle.net/2142/100458

Description

Title
Improvement of the dissociation energy of the hydrogen molecule (Part one)
Author(s)
Hussels, Joël
Contributor(s)
  • Jungen, Christian
  • Hu, Shui-Ming
  • Tao, Lei-Gang
  • Merkt, Frederic
  • Agner, Josef A.
  • Hoelsch, Nicolas
  • Beyer, Maximilian
  • Ubachs, Wim
  • Salumbides, Edcel John
  • Eikema, K.S.E.
  • Bethlem, Hendrick
  • Niu, Ming Li
  • Cheng, Cunfeng
Issue Date
2018-06-22
Keyword(s)
Comparing theory and experiment
Date of Ingest
  • 2018-08-17T16:08:51Z
  • 2018-12-12T22:36:31Z
Abstract
The dissociation energy (D0) of ortho H2 is a benchmark value in quantum chemistry, with recent QED calculations now approaching accuracies achievable in simple atoms. A precision measurement of the GK-X molecular transition, in combination with other precision measurements (see also part two), provides an improved value for D0.[1, 2] The GK-X transition is excited through Doppler-free two-photon spectroscopy using 179-nm radiation, based on frequency up-conversion using a special KBBF crystal. The optical frequency of the fundamental (716 nm), which is the output of a narrowband pulsed Ti:Sa laser system, is locked to a frequency comb. This enables accuracies at the sub-MHz level, leading to an order-of-magnitude improvement for D0 to the 10−9 level of accuracy. The comparison of this accurate experimental result with the best calculations may provide a test of the Standard Model of Physics.[3] [1] D. Sprecher, Ch. Jungen, W. Ubachs and F. Merkt, Faraday Discussions 150, 51-70 (2011) [2] W. Ubachs, J.C.J. Koelemeij, K.S.E. Eikema and E.J. Salumbides, J. Mol. Spectr. 320, 1-12 (2016) [3] J. Liu, E. J. Salumbides, U. Hollenstein, J. C. J. Koelemeij, K. S. E. Eikema, W. Ubachs and F. Merkt, J. Chem. Phys. 130 (17), 174306 (2009)
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
text
Genre of Resource
Conference Paper / Presentation
Language
eng
Permalink
http://hdl.handle.net/2142/100458
DOI
10.15278/isms.2018.FC06
Copyright and License Information
Copyright 2018 Joël Hussels

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Abstracts & Presentations - 2018 International Symposium on Molecular Spectroscopy PRIMARY