W. Ubachs

activity

20242026

most citedInfluence of source parameters on the longitudinal phase-space distribution of a pulsed cryogenic beam of barium fluoride molecules

11 citations · 16 across the 7 of their papers we have counts for

collaborators

Showing 2025Show all

3 papers · 1 filter

astro-ph.CO2025★ 2 cited

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…

physics.atom-ph2025

Precision spectroscopy of the $A^{2} Π$ $\leftarrow$ $X^{2} Σ^{+}$ transition in BaF

M. C. Mooij, H. L. Bethlem, W. Ubachs +14

High-resolution spectroscopy on the $A^{2} Π$ - $X^{2} Σ^{+}$ electronic system of $^{138}$ Ba $^{19}$ F is performed using a cold molecular beam produced by a buffer gas source. The hyperfin…

physics.atom-ph2025

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 ( $^{138}$ Ba $^{19}$ …

A sub-ppm upper limit on the cosmological variations of the fine structure constant alpha

Precision spectroscopy of the A2Π ← X2Σ+ transition in BaF

2D transverse laser cooling of a hexapole focused beam of cold BaF molecules

Precision spectroscopy of the $A^{2} Π$ $\leftarrow$ $X^{2} Σ^{+}$ transition in BaF