July 2026: OBSPARIS has set up a GPS link between IC and OBSPARIS to provide SI tracability, via the timescale UTC(OP), of the molecular spectroscopy measurement performed by IC.
July 2026: Efforts towards improving the theoretical predictions of rovibrational transition frequencies in molecular hydrogen ions are ongoing, through the calculation of the one-loop self-energy correction to the energy levels. A numerical method to perform this calculation has been developed and shown to yield high accuracy in the case of hydrogenlike atoms.
June 2026: record continuous tunability of an ultra-stable 10 µm QCL over 10 GHz, using a new generation amplitude modulator and a home made phase-jump-free tunable microwave synthesizer.
May 2026: Developed a theoretical analysis of the potential accuracy of H2+/anti-H2+ spectroscopy in a Penning trap https://arxiv.org/abs/2605.16585v1.
April 2026: Achieved a precision measurement of the hyperfine structure of HD+ and of the bound-electron g-factor. Published in Phys. Rev. Lett. 136 143002 (2026) https://doi.org/10.1103/vrl8-bpmz.
November 2025: CNRS has achieved a 10-11 accuracy on an ethylene rovibrational transition at 10.3 µm.
November 2025: Improved hydrogen molecular ion g-factor published in Phys. Rev. A 112, 052813. doi: 10.1103/cb1q-fhk5
October 2025: Validation of distant calibration of the IC frequency reference via GPS at the 10-15 level
OBSPARIS has characterized the short- and long-term performances of the IC frequency reference by a direct collocated comparison against the local timescale UTC(OP), and via a high-grade GPS receiver using common-view techniques, to prepare the measurement strategy at IC. The closure between direct and GPS comparison reached the 10-15 level at averaging periods of a few days or a fraction of a day, depending on the GPS comparison technique.
October 2025: First laser-slowed molecular beam in Italy
INRIM has successfully applied laser light to slow a CaF molecular beam produced in a buffer gas source.
September 2025: ERC starting grant awarded to Alessio Ciamei "An ultracold Molecule Platform for fundamental Asymmetry Searches" INRIM (former CNR).
September 2025: record continuous tunability of an ultra-stable 10 µm QCL over 10 GHz, using an ultra-fast mid-IR detector and a home made phase-jump-free tunable microwave synthesiser.
August 2025: Modelling the accuracy of the determination of fundamental constants from hydrogen molecular ion spectroscopy, published in Phys. Rev. A 112, 022809 (2025). UEVE and HHUD. https://doi.org/10.1103/jz54-7f7b
August 2025: Record precision for a key fundamental constant: New determination of the proton–electron mass ratio with 26-ppt relative uncertainty from spectroscopy of H2+ (Nature 644, 69 (2025) https://doi.org/10.1038/s41586-025-09306-2
August 2025: Record precision for a key fundamental constant
New determination of the proton–electron mass ratio with 26-ppt relative uncertainty.
July 2025: First Doppler-free two-photon vibrational transition signal in H2+ at UEVE CNRS LKB.
July 2025: A high phase-space density gas of paramagnetic fermionic molecules
CNR has successfully produced LiCr fermionic dimers at phase-space densities exceeding 0.1.
July 2025: First Interband Cascade Laser frequency-locked to a whispering gallery mode resonator: laser linewidth narrowed to 10 kHz.
June 2025: Interisotope Feshbach spectroscopy on LiCr and Cr2 dimers
Feshbach spectra on three different Li-Cr isotopic combinations, as well as on 50Cr-50Cr, allow the CNR team to unambiguously fix the number of states of the LiCr and Cr2 molecular potentials.
June 2025: ARTIQ automation integrated for hybrid Be+/HD+ trapping
Implementation of the consortium’s ARTIQ-based control architecture at HHU, enabling reproducible loading/detection and paving the way to fully automated cycles.
March 2025: UEVE CNRS LKB has achieved 7 Hz statistical accuracy on a formic acid rovibrational transition at 9.2 µm.
Spring 2025: Quantum-logic spectroscopy of forbidden vibrational transitions
UNIBAS has realised the first SI-traceable spectroscopic measurements on forbidden vibrational transitions in single N2+ ions using quantum logic.
February 2025: Extending frequency metrology to increasingly complex molecules: SI-traceable sub-Doppler mid-IR spectroscopy of trioxane, the largest molecules ever resolved by sub-Doppler spectroscopy in the mid-IR
https://arxiv.org/abs/2502.08201
Autumn 2024: The coldest cavity-enhanced spectrum of molecular hydrogen
UMK has successfully measured the rovibrational spectrum of molecular hydrogen in the deep cryogenic regime (down to below 5 K). GUM provided the time/frequency reference that ensures the SI traceability of the measurements.
July 2024: EGAS 55 (Granada)
Talk on precision spectroscopy of molecular hydrogen ions, strengthening the project’s profile within the AMO community.
June 2024: International visibility at PPSAS 2024 (CERN)
Presentation on precision vibrational spectroscopy of molecular hydrogen ions, highlighting COMOMET’s metrological objectives.