Abstract
The ionization energy of HD has been determined to be EI(HD)=124568.48466(7)cm-1 by two-photon Doppler-free vacuum-ultraviolet pulsed laser spectroscopy, near-infrared continuous-wave laser spectroscopy, and Rydberg-series extrapolation by multichannel quantum-defect theory (MQDT). From this value, the dissociation energy of HD is deduced to be D0(HD)=36405.78253(7)cm-1, representing a fivefold improvement over previous values and resolving a 3.2σ disagreement with ab initio calculations of the four-particle nonadiabatic relativistic energy and of quantum-electrodynamic corrections up to order mα6. Interactions between d, f, and g Rydberg series have been observed and had to be included in the MQDT extrapolation of the Rydberg series.
| Original language | English |
|---|---|
| Article number | 022811 |
| Pages (from-to) | 1-12 |
| Number of pages | 12 |
| Journal | Physical Review A |
| Volume | 108 |
| Issue number | 2 |
| Early online date | 22 Aug 2023 |
| DOIs | |
| Publication status | Published - Aug 2023 |
Bibliographical note
Funding Information:The authors thank M. Silkowski and K. Pachucki (Warsaw) for making available further potential-energy curves for excited states of hydrogen prior to publication. K.S.E.E., F.M., and W.U. acknowledge financial support from European Research Council advanced grants under the European Union's Horizon 2020 research and innovation program (Grants No. 695677, No. 743121, and No. 670168). H.L.B., K.S.E.E., and W.U. acknowledge NWO for a program grant on “The mysterious size of the proton.” F.M. acknowledges financial support from the Swiss National Science Foundation (Project No. 200020B-200478 and Sinergia Grant No. CRSII5-183579). M.B. acknowledges NWO for a VENI grant (Grant No. VI.Veni.202.140).
Publisher Copyright:
© 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.