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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
Subject(s):Comparing theory and experiment
Abstract:The dissociation energy (D$_0$) of ortho H$_2$ 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 D$_0$.$[1,2]$ 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 D$_0$ 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)\\
Issue Date:06/22/18
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:Conference Paper / Presentation
Type:Text
Language:English
URI:http://hdl.handle.net/2142/100458
DOI:10.15278/isms.2018.FC06
Other Identifier(s):FC06
Date Available in IDEALS:2018-08-17
2018-12-12


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