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Submit Date Name Organisation Statement of capabilities/facilities
2020-08-11. Stephan Schiller Heinrich-Heine-Universität Düsseldorf Our work focuses on the molecular hydrogen ions HD+, H2+ and D2+. We performe ensemble spectroscopy, both rotational and vibrational. Recently, we performed a precise measurement of a rotational transition in HD+ and compared it with the most precise theoretical calculations. This allowed a determination of a fundmental mass ratio and setting improved limits on a hypothetical fifth force.

Our future activities will be aimed at improving the precision of the transition frequency determination, by more precisely determining the frequency shifts.
In addition, we seek to continue the development of metrology-grade mid-IR laser sources, which are of general interest for vibrational spectroscopy of most molecules. At this time, our laser sources can provide 5 µm radiation with Allan Deviation 1E-14 and sub-100 Hz linewidth. The frequency is measurable with 1E-13 precision.
2020-07-05. Michael Drewsen Aarhus University We are a research group with interest in developing various schemes for controlling the quantum states of molecular ions, and for performing photon recoil (quantum logic) spectroscopy on these. With respect to the latter activity, we wish in the future to reference laser sources in the mid-infrared, which are used to address vibrational transitions in MgH+ (and potentially CaH+) to a frequency comb to our disposal.

Since we do not have frequency standards available with extreme precision, our contribution to the project would be more from point of view of developing novel concepts, and methods of acquiring data.

2020-07-03. Simone Borri CNR-INO - Istituto Nazionale di Ottica Experience in laser frequency stabilization, linewidth narrowing, development of mid-IR coherent sources, high precision spectroscopy
2020-07-01. Laurent Hilico Université d'Evry - Experimental plateform to perform Doppler-free two-photon MIR spectroscopy on state selected cold H2+ molecular ions.
- Theoretical activity in high precision calculations on hydrogen molecular ions, spin average transition frequencies and hyperfine structure.

2020-07-01. Maciej Gruszczynski Central Office of Measures Centrral Office of Measures (GUM - Polish NMI), Time and Frequency Laboratory in strict cooperation with Nicolaus Copernicus University, will develop and maintain the optical frequency control/measurement part in the cryogenic cavity-enhanced spectrometer run at Nicolaus Copernicus University. In particular GUM will:
- develop and maintain local fiber link with optical frequency comb with the usage of microwave frequency transmitted over long distance fiber link (from UTC(AOS));
- develop an active feedback loop from comb to laser unit to stabilize long-term frequency drift;
- develop a system for automatic locking and scanning the absolute optical frequency.
2020-06-29. Jacques Morel Federal Institute of Metrology METAS - METAS is the Swiss NMI

- Our Photonics Time and Frequency laboratory has an ongoing activity towards the implementation of a stabilized optical fibre network for the dissemination and for the comparison of reference frequencies in Switzerland, especially for spectroscopy applications.

2020-06-26. Florin Lucian Constantin CNRS The team “Molecular Spectroscopy at Interfaces” (Laboratoire PhLAM, CNRS UMR 8523, 59655 Villeneuve d’Ascq, France) has theoretical and experimental expertise in the field of molecular spectroscopy. The applications are in the fields of precision measurements with molecules (tests of the Standard Model, searches for new forces), astrophysics, frequency metrology, and metrology of fundamental constants. The team developed different spectrometers for Fourier-transform microwave spectroscopy, chirped-pulse millimeter-wave spectroscopy, and continuous-wave THz spectroscopy by exploiting electronic and photonic approaches. The recent developments of this team require delivery of SI traceable frequency references and development of sub-Doppler spectroscopy techniques using the saturated absorption technique and molecular ion traps.
2020-06-24. Piet Schmidt Leibniz University Hannover (LUH) We can offer:
* quantum logic state detection technique for molecules
* quantum logic state preparation and spectroscopy, adaptable to molecules
* new molecular beam setup to load state-selected O2+ into Paul trap with Ca+ as logic ion
* precision spectroscopy, optical clock and laser stabilisation expertise
* UV laser and UV fibre technology
2020-06-23. Benoît Darquié Laboratoire de Physique des Lasers, CNRS-Université Sorbonne Paris Nord This team pursues experimental researches in the field of precision vibrational spectroscopy of polyatomic molecules in the gas phase with applications to precision tests of fundamental physics, metrology and the development of frequency standards in the mid-infrared. The activity is at the forefront of cold molecule research and frequency metrology. It necessitates the development of mid-infrared spectrometers based on ultra-stable and SI traceable quantum cascade lasers, buffer-gas sources of cold and slow polyatomic molecules, sub-Doppler spectroscopy devices and Ramsey interferometers, and techniques for the coherent control and detection of internal molecular states. The team also pursues activities in the field of ultra-stable frequency dissemination through optical fibre links at a continental scale.
2020-06-23. Gianluca Bertaina INRiM I am a computational physicist, expert in quantum Monte Carlo methods applied to the study of the equilibrium and spectral properties of many-body systems such as cold atomic bosons or fermions. I also have experience in semiclassical methods for the evaluation of molecular vibrational spectra and in the numerical evaluation of the inverse Laplace transform.

I typically use high performance computing facilities to perform massively parallel simulations. My languages of choice are Fortran, Mathematica and Python.
2020-06-20. Wim Ubachs Vu Amsterdam Molecular clocks and IR frequency standards based on hydrogen molecules (incl isotopologues) at cryogenic temperatures, strong link to fundamental physics: test of QED, search for new forces.
2020-06-19. Piotr Wcislo Nicolaus Copernicus University Goals: Accurate optical metrology of cold molecules for: testing QED, determination of fundamental constants, searching for new physics, studying collisional effects, testing PESs. Development of new high-resolution spectrometers operating at cryogenic conditions.

So far results: The most accurate measurement of rovibrational splitting in homonuclear isotopologues of H2. First constraint on dark matter coupling with SM fields with optical atomic clocks. Establishing a global network of optical atomic clocks aimed at dark matter searches. New cavity-enhanced techniques (CMDS, CMWS, CBDS) for reducing experimental systematics. Ab initio calculations of collision-induced systematic effects in molecular spectra and hyperfine structure in HD, H2, D2, HT, DT, T2.

Infrastructure: Cryogenic installation for cavity-enhanced spectroscopy. Narrow lasers and optical frequency combs referenced to optical lattice Sr clocks and fiber linked to primary second standard at Polish NMI.
2020-06-19. Matthias Keller University of Sussex Research activity: High resolution spectroscopy of molecular nitrogen ions.
2020-06-18. Michael Tarbutt Imperial College London Expertise in direct laser cooling of molecules and tests of fundamental physics with molecules.
2020-06-18. Laurent HILICO Université d'Evry
2020-06-17. Michel Abgrall LNE-SYRTE LNE-SYRTE is the French NMI for time and frequency metrology
2020-06-15. Stefan Willitsch University of Basel Expertise and infrastructure for precision spectroscopy of single cold molecular ions; quantum logic spectroscopy; Swiss network for precise distribution and comparison of reference frequencies and primary frequency standards (currently being set up)
2020-06-15. Gabriele Santambrogio INRIM Our lab has three molecular beam apparatuses and an IR laser system that is referred to the Italian primary frequency standard via fibre link. The fibre link connects us also to another molecular spectroscopy lab (INO-CNR) 500 km away. We have good knowhow in molecular beams, molecular spectroscopy and laser development.

We are currently developing a new approach to feed a molecular beam into a buffer-gas-cooling cell. We aim at the continuous production of various laser-coolable molecules, such as metal halides, with high beam intensity.

Finally, we have expertise in manipulating neutral molecules with non-homogenous electric fields. One of our Stark decelerators is realised on a microchip.
2020-06-15. Hendrick Bethlem Vrije Universiteit Amsterdam Our group performs precision measurements on (cold) molecules to test fundamental physics theories. We have two in house molecular clocks, one based on trapped HD ions and one based on ammonia molecules in a fountain.
2020-06-12. Paul-Eric Pottie SYRTE (OP/PSL.SU/CNRS) SYRTE is the french NMI

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