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Rick Bethlem
Address
Prof. Dr. Hendrick L. Bethlem
Quantum Metrology and Laser Applications, LaserLaB VU
Faculty of Science, Vrije Universiteit Amsterdam
De Boelelaan 1081
1081 HV Amsterdam
The Netherlands
And:
Van Swinderen Institute for Particle Physics and Gravity
University of Groningen, The Netherlands
Office
Room T2.61
Phone +31-(0)20-598 7951
Laser Lab
Room Kb1.42
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WE ARE LOOKING FOR A PHD STUDENT TO BUILD A FOUNTAIN FOR BAF MOLECULES
Please contact me (H.L.Bethlem@vu.nl) for more information.
NEWS
- 22-10-2024 Thesis defense of Anno Touwen! Find his thesis here.
- 14-02-2024 Our paper on "Manipulating a beam of barium fluoride molecules using an electrostatic hexapole" is submitted arXiv2402.09300.
- 29-01-2024 Our paper on "Influence of source parameters on the longitudinal phase-space distribution of a pulsed cryogenic beam of barium fluoride molecules" is submitted arxiv2401.16590.
- 29-01-2024 Our paper on "A novel method to determine the phase-space distribution of a pulsed molecular beam" is submitted arxiv2401.16588.
- 04-06-2023 Our paper on "The alpha and helion particle charge radius difference from spectroscopy of quantum-degenerate helium" is submitted arxiv2306.02333.
- 11-03-2023 Our paper on "Novel spin-precession method for sensitive EDM searches" is submitted arxiv2303.06402.
Research
See a youtube movie on my research here.
And a youtube movie on the research in the QMLA group here.
A molecular fountain
The resolution of any spectroscopic or interferometric experiment is ultimately limited by the total time a particle is interrogated. We have recently demonstrated the first molecular fountain, a development
which permits hitherto unattainably long interrogation times with molecules. In our experiments,
ammonia molecules are decelerated and cooled using electric fields, launched upwards and observed
as they fall back under gravity. Over the last couple of year we have performed
vibrational spectroscopy on cold (<100μK) ammonia molecules that are released from an
electrostatic trap using two diode lasers that are locked to a frequency comb.
Measuring the electric dipole moment of the electron (eEDM) in BaF
The electric dipole is a sensitive probe for physics beyond the Standard Model of particle physics.
The NL-eEDM consortium is building a machine to measure the eEDM in a beam of Stark-decelerated and
laser-cooled bariumfluoride molecules. At the Vrije Universiteit Amsterdam, we have built and optimized
a new cryogenic buffer gas source of BaF.
Furthermore I am involved in experiments on metastable helium
with Kjeld Eikema .
See a list of my publications on
Web of Science or Google Scholar
Links
Section Quantum Metrology and Laser Applications
Department of Physics
LaserLab
Faculty of Sciences
Van Swinderen Institute, University of Groningen
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