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

Hussels, Joël

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

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

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

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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