Abstract
The ionization energy of ortho-H2 has been determined to be EIo(H2)/(hc)=124 357.238 062(25) cm-1 from measurements of the GK(1,1)-X(0,1) interval by Doppler-free, two-photon spectroscopy using a narrow band 179-nm laser source and the ionization energy of the GK(1,1) state by continuous-wave, near-infrared laser spectroscopy. EIo(H2) was used to derive the dissociation energy of H2, D0N=1(H2), at 35 999.582 894(25) cm-1 with a precision that is more than one order of magnitude better than all previous results. The new result challenges calculations of this quantity and represents a benchmark value for future relativistic and QED calculations of molecular energies.
Original language | English |
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Article number | 013001 |
Pages (from-to) | 1-5 |
Number of pages | 5 |
Journal | Physical Review Letters |
Volume | 121 |
Issue number | 1 |
Early online date | 3 Jul 2018 |
DOIs | |
Publication status | Published - 6 Jul 2018 |
Funding
F. M. and W. U. acknowledge the European Research Council for an ERC-Advanced grant under the European Union’s Horizon 2020 research and innovation programme (Grant agreement No. 670168 and No. 743121). The project is funded by Laserlab-Europe EU-H2020 654148. H. B., K. E., and W. U. acknowledge FOM/NWO for a program grant on “The Mysterious Size of the Proton.” F. M. acknowledges the Swiss National Science Foundation (Project No. 200020-172620). S. H. acknowledges the support from NSFC (21688102) and CAS (XDB21020100).
Funders | Funder number |
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ERC-Advanced | |
EU-H2020 | |
Horizon 2020 Framework Programme | 743121, 670168, 654148 |
College of Arts and Sciences, University of Nebraska-Lincoln | XDB21020100 |
European Research Council | |
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung | 200020-172620 |
National Natural Science Foundation of China |