Search Results - "Wim Ubachs"

Measuring the electric dipole moment of the electron in BaF by Aggarwal, Parul, Bethlem, Hendrick L., Borschevsky, Anastasia, Denis, Malika, Esajas, Kevin, Haase, Pi A. B., Hao, Yongliang, Hoekstra, Steven, Jungmann, Klaus, Meijknecht, Thomas B., Mooij, Maarten C., Timmermans, Rob G. E., Ubachs, Wim, Willmann, Lorenz, Zapara, Artem

“…We investigate the merits of a measurement of the permanent electric dipole moment of the electron ( e EDM) with barium monofluoride molecules, thereby…”
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Spectroscopic-network-assisted precision spectroscopy and its application to water by Tóbiás, Roland, Furtenbacher, Tibor, Simkó, Irén, Császár, Attila G., Diouf, Meissa L., Cozijn, Frank M. J., Staa, Joey M. A., Salumbides, Edcel J., Ubachs, Wim

“…Frequency combs and cavity-enhanced optical techniques have revolutionized molecular spectroscopy: their combination allows recording saturated Doppler-free…”
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Topical issue: precision physics of simple atomic systems by Pachucki, Krzysztof, Udem, Thomas, Ubachs, Wim, Crivelli, Paolo, Ulmer, Stefan

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A Stringent Limit on a Drifting Proton-to-Electron Mass Ratio from Alcohol in the Early Universe by Bagdonaite, Julija, Jansen, Paul, Henkel, Christian, Bethlem, Hendrick L., Menten, Karl M., Ubachs, Wim

“…The standard model of physics is built on the fundamental constants of nature, but it does not provide an explanation for their values, nor require their…”
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Grüneisen approach for universal scaling of the Brillouin shift in gases by Liang, Kun, Xu, Jiaqi, Wang, Yuanqing, Lü, Hai-Feng, Ubachs, Wim

“…A Grüneisen relationship is defined for gases, following the formulation of the original microscopic Grüneisen ratio γ = (d ln  ω )/(d ln  V ) for solids. In…”
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Determination of the ionization and dissociation energies of the deuterium molecule (D(2)) by Liu, Jinjun, Sprecher, Daniel, Jungen, Christian, Ubachs, Wim, Merkt, Frédéric

“…The transition wave numbers from selected rovibrational levels of the EF (1)Sigma(g) (+)(v=0) state to selected np Rydberg states of ortho- and para-D(2)…”
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Methanol as a sensitive probe for spatial and temporal variations of the proton-to-electron mass ratio by Jansen, Paul, Xu, Li-Hong, Kleiner, Isabelle, Ubachs, Wim, Bethlem, Hendrick L

“…The 6.7 and 12.2 GHz masers, corresponding to the 5(1) → 6(0)A+ and 2(0) → 3(-1)E transitions in methanol (CH3OH), respectively, are among the brightest radio…”
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New constraint on cosmological variation of the proton-to-electron mass ratio from Q0528−250 by King, Julian A., Murphy, Michael T., Ubachs, Wim, Webb, John K.

“…Molecular hydrogen transitions in quasar spectra can be used to constrain variation in the proton-to-electron mass ratio, μ≡ m p/m e, at high redshifts (z ≳…”
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Characterization of a Novel Temperature Lidar Receiver by Means of Laboratory Rayleigh-Brillouin Scattering Measurements by Xu, Jiaqi, Witschas, Benjamin, Liang, Kun, Wang, Yuanqing, Ubachs, Wim

“…A new receiver setup based on an imaging Fizeau interferometer measuring the Rayleigh Brillouin scattering (RBS) spectra to retrieve tropospheric temperature…”
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Extreme Ultraviolet Frequency Comb Metrology by Kandula, Dominik Z., Gohle, Christoph, Pinkert, Tjeerd J., Ubachs, Wim, Eikema, Kjeld S. E.

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The Pancharatnam-Berry phase for non-cyclic polarization changes by van Dijk, Thomas, Schouten, Hugo F, Ubachs, Wim, Visser, Taco D

“…We present a novel setup that allows the observation of the geometric phase that accompanies polarization changes in monochromatic light beams for which the…”
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Fourier-Transform VUV Spectroscopy of 14,15N and 12,13C by Lai, Kin-Fung, Ubachs, Wim, De Oliveira, Nelson, Salumbides, Edcel J.

“…Accurate Fourier-transform spectroscopic absorption measurements of vacuum ultraviolet transitions in atomic nitrogen and carbon were performed at the Soleil…”
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Crisis and catharsis in atomic physics by Ubachs, Wim

“…Precise measurement of an atomic hydrogen transition resolves the proton size puzzle The spectrum of the simplest atomic species, the hydrogen (H) atom with…”
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Search for Varying Constants of Nature from Astronomical Observation of Molecules by Ubachs, Wim

“…The status of searches for possible variation in the constants of nature from astronomical observation of molecules is reviewed, focusing on the dimensionless…”
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Probing the Gravitational Dependence of the Fine-Structure Constant from Observations of White Dwarf Stars by Bainbridge, Matthew, Barstow, Martin, Reindl, Nicole, Tchang-Brillet, W.-Ü, Ayres, Thomas, Webb, John, Barrow, John, Hu, Jiting, Holberg, Jay, Preval, Simon, Ubachs, Wim, Dzuba, Vladimir, Flambaum, Victor, Dumont, Vincent, Berengut, Julian

“…Hot white dwarf stars are the ideal probe for a relationship between the fine-structure constant and strong gravitational fields, providing us with an…”
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A testing time for antimatter by Ubachs, Wim

“…Precision measurement of antiprotonic helium provides a test of physical laws Spectroscopy is the most accurate branch of science. Optical transition…”
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The Measurement of Tropospheric Temperature Profiles using Rayleigh-Brillouin Scattering: Results from Laboratory and Atmospheric Studies by Witschas, Benjamin, Reitebuch, Oliver, Lemmerz, Christian, Kableka, Pau Gomez, Kondratyev, Sergey, Gu, Ziyu, Ubachs, Wim

“…In this letter, we suggest a new method for measuring tropospheric temperature profiles using Rayleigh-Brillouin (RB) scattering. We report on laboratory RB…”
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Temperature retrieval from Rayleigh-Brillouin scattering profiles measured in air by Witschas, Benjamin, Gu, Ziyu, Ubachs, Wim

“…In order to investigate the performance of two different algorithms for retrieving temperature from Rayleigh-Brillouin (RB) line shapes, RB scattering…”
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Hyperfine structure in a vibrational quadrupole transition of ortho-H 2 by Diouf, Meissa L., Cozijn, Frank M. J., Ubachs, Wim

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Benchmarking Theory with an Improved Measurement of the Ionization and Dissociation Energies of H2 by Hölsch, Nicolas, Beyer, Maximilian, Salumbides, Edcel J, Eikema, Kjeld S E, Ubachs, Wim, Jungen, Christian, Merkt, Frédéric

“…The dissociation energy of H 2 represents a benchmark quantity to test the accuracy of first-principles calculations. We present a new measurement of the…”
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