Benchmarking Theory with an Improved Measurement of the Ionization and Dissociation Energies of H2

Nicolas Hölsch, Maximilian Beyer, Edcel J. Salumbides, Kjeld S.E. Eikema, Wim Ubachs, Christian Jungen, Frédéric Merkt

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The dissociation energy of H2 represents a benchmark quantity to test the accuracy of first-principles calculations. We present a new measurement of the energy interval between the EF Σ1g+(v=0,N=1) state and the 54p11 Rydberg state of H2. When combined with previously determined intervals, this new measurement leads to an improved value of the dissociation energy D0N=1 of ortho-H2 that has, for the first time, reached a level of uncertainty that is 3 times smaller than the contribution of about 1 MHz resulting from the finite size of the proton. The new result of 35 999.582 834(11) cm-1 is in remarkable agreement with the theoretical result of 35 999.582 820(26) cm-1 obtained in calculations including high-order relativistic and quantum-electrodynamics corrections, as reported in the following Letter [M. Puchalski, J. Komasa, P. Czachorowski, and K. Pachucki, Phys. Rev. Lett. 122, 103003 (2019)PRLTAO0031-900710.1103/PhysRevLett.122.103003]. This agreement resolves a recent discrepancy between experiment and theory that had hindered a possible use of the dissociation energy of H2 in the context of the current controversy on the charge radius of the proton.

Original languageEnglish
Article number103002
Pages (from-to)1-6
Number of pages6
JournalPhysical Review Letters
Volume122
Issue number10
DOIs
Publication statusPublished - 15 Mar 2019

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dissociation
ionization
intervals
protons
energy
quantum electrodynamics
radii

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Hölsch, Nicolas ; Beyer, Maximilian ; Salumbides, Edcel J. ; Eikema, Kjeld S.E. ; Ubachs, Wim ; Jungen, Christian ; Merkt, Frédéric. / Benchmarking Theory with an Improved Measurement of the Ionization and Dissociation Energies of H2. In: Physical Review Letters. 2019 ; Vol. 122, No. 10. pp. 1-6.
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Benchmarking Theory with an Improved Measurement of the Ionization and Dissociation Energies of H2. / Hölsch, Nicolas; Beyer, Maximilian; Salumbides, Edcel J.; Eikema, Kjeld S.E.; Ubachs, Wim; Jungen, Christian; Merkt, Frédéric.

In: Physical Review Letters, Vol. 122, No. 10, 103002, 15.03.2019, p. 1-6.

Research output: Contribution to JournalArticleAcademicpeer-review

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