6 papers
Statistics and systematics of electron EDM searches with BaF
A. Boeschoten, V. R. Marshall, T. B. Meijknecht +26
The NL-EDM experiment searches for a non-zero electric dipole moment of the electron (EDM) in the ground state of barium monofluoride (BaF). A beam of BaF from a supers…
Spectroscopy of He at 0.25 ppt Uncertainty and Improved Alpha-Helion Charge-Radius Difference Determination
K. Steinebach, J. C. J. Koelemeij, H. L. Bethlem +1
High-precision spectroscopy of simple atomic systems can be used to advance the theory of atomic energy levels but can also serve as a sensitive probe of nuclear charge radii. For…
A sub-ppm upper limit on the cosmological variations of the fine structure constant alpha
S. Muller, A. Beelen, M. Guelin +9
Absorption spectroscopy toward high-redshift quasars provides strong constraints on the putative variation of fundamental constants of physics on cosmological time scales. The subm…
A cold beam of BaOH molecules using a water-vapour seeded neon gas
Ties Hendrik Fikkers, Nithesh Balasubramanian, Joost W. F. van Hofslot +3
In this paper we report on the production and characterization of a cold beam of BaOH molecules using a cryogenic buffer-gas beam source. BaOH is a highly suitable molecule for stu…
Precision spectroscopy of the transition in BaF
M. C. Mooij, H. L. Bethlem, W. Ubachs +14
High-resolution spectroscopy on the - electronic system of BaF is performed using a cold molecular beam produced by a buffer gas source. The hyperf…
2D transverse laser cooling of a hexapole focused beam of cold BaF molecules
Joost W. F. van Hofslot, Izabella E. Thompson, Anno Touwen +18
A cryogenic buffer gas beam, an electrostatic hexapole lens, and 2D transverse Doppler laser cooling are combined to produce a bright beam of barium monofluoride (Ba…