164 citations · 1.1k across the 34 of their papers we have counts for
34 papers
Optically Derived Radio-Frequency Benchmark in Methanol: A Sub-kHz Reference for Astrophysical Tests of Fundamental Physics
Frank M. J. Cozijn, Arthémise Altman, Alexandr S. Bogomolov +8
Methanol radio lines observed in space provide sensitive probes of whether the proton-to-electron mass ratio has changed over cosmic time, but such tests require laboratory rest fr…
Chirp-compensated pulsed titanium-sapphire laser system for precision spectroscopy
J. Hussels, C. Cheng, E. J. Salumbides +1
Active frequency-chirp compensation for a narrowband pulsed Titanium-Sapphire laser system is demonstrated using an intra-cavity electro-optic modulator resulting in improved spect…
Two-photon Doppler-free ultraviolet laser spectroscopy on sulphur atoms
K. -F. Lai, E. J. Salumbides, W. Ubachs
The P - P transition in the sulphur atom is investigated in a precision two-photon excitation scheme under Doppler-free and collision-fr…
Precision measurement of the fundamental vibrational frequencies of tritium-bearing hydrogen molecules: T, DT, HT
K. -F. Lai, V. Hermann, T. M. Trivikram +4
High-resolution coherent Raman spectroscopic measurements of all three tritium-containing molecular hydrogen isotopologues T, DT and HT were performed to determine the ground e…
Relativistic and QED effects in the fundamental vibration of T
T. Madhu Trivikram, M. Schlösser, W. Ubachs +1
The hydrogen molecule has become a test ground for quantum electrodynamical calculations in molecules. Expanding beyond studies on stable hydrogenic species to the heavier radioact…
Sub-Doppler frequency metrology in HD for test of fundamental physics
F. M. J. Cozijn, P. Dupre, E. J. Salumbides +2
Weak transitions in the (2,0) overtone band of the HD molecule at m were measured in saturated absorption using the technique of noise-immune cavity-enhanced optical…
Rayleigh-Brillouin light scattering spectroscopy of nitrous oxide (NO)
Y. Wang, K. Liang, W. van de Water +2
High signal-to-noise and high-resolution light scattering spectra are measured for nitrous oxide (NO) gas at an incident wavelength of 403.00 nm, at 90 scattering, at r…
Ion distribution and ablation depth measurements of a fs-ps laser-irradiated solid tin target
M J Deuzeman, A S Stodolna, E E B Leerssen +9
The ablation of solid tin surfaces by an 800-nanometer-wavelength laser is studied for a pulse length range from 500 fs to 4.5 ps and a fluence range spanning 0.9 to 22 J/cm^2. The…
Constraint on a varying proton-to-electron mass ratio from H2 and HD absorption at z = 2.34
M. Daprà, M. van der Laan, M. T. Murphy +1
Molecular hydrogen absorption in the damped Lyman-alpha system at z = 2.34 towards quasar Q1232+082 is analyzed in order to derive a constraint on a possible temporal variation of…
Precision measurements and test of molecular theory in highly-excited vibrational states of H
T. Madhu Trivikram, M. L. Niu, P. Wcisło +2
Accurate transition energies in molecular hydrogen were determined for transitions originating from levels with highly-excited vibrational quantum number,…
High-precision spectroscopy of the HD+ molecule at the 1-p.p.b. level
J. Biesheuvel, J. -Ph. Karr, L. Hilico +3
Recently we reported a high precision optical frequency measurement of the (v,L):(0,2)->(8,3) vibrational overtone transition in trapped deuterated molecular hydrogen (HD+) ions at…
Spectroscopy and perturbation analysis of the A(v=0) state of CO
M. L. Niu, R. Hakalla, T. Madhu Trivikram +4
The lowest level of the A, state of the CO isotopologue of carbon monoxide has been reinvestigated with a variety of high resolution spectroscopic techniqu…
Constraint on a cosmological variation in the proton-to-electron mass ratio from electronic CO absorption
M. Daprà, M. L. Niu, E. J. Salumbides +2
Carbon monoxide (CO) absorption in the sub-damped Lyman- absorber at redshift , toward the background quasar SDSS J123714.60+064759.5 (J1237+0647), was inve…
Spectroscopy and perturbation analysis of the CO AX (2,0), (3,0) and (4,0) bands
M. L. Niu, E. J. Salumbides, A. N. Heays +3
The (2,0) (3,0) and (4,0) bands of the AX system of CO have been re-investigated by high-resolution vacuum ultraviolet absorption spectroscopy. A VUV Fou…
Constraint on a varying proton-to-electron mass ratio from molecular hydrogen absorption toward quasar SDSS J123714.60+064759.5
M. Daprà, J. Bagdonaite, M. T. Murphy +1
Molecular hydrogen transitions in the sub-damped Lyman alpha absorber at redshift z = 2.69, toward the background quasar SDSS J123714.60+064759.5, were analyzed in order to search…
Rayleigh-Brillouin Scattering in Binary Gas Mixtures
Ziyu Gu, Wim Ubachs, Willem van de Water +1
Precise measurements are performed on spectral lineshapes of spontaneous Rayleigh-Brillouin scattering in mixtures of the noble gases Ar and Kr, with He. Admixture of a light He at…
A constraint on a varying proton--electron mass ratio 1.5 billion years after the Big Bang
J. Bagdonaite, W. Ubachs, M. T. Murphy +1
A molecular hydrogen absorber at a lookback time of 12.4 billion years, corresponding to 10 of the age of the universe today, is analyzed to put a constraint on a varying proto…
High-precision laser spectroscopy of the CO A - X (2,0), (3,0) and (4,0) bands
M. L. Niu, F. Ramirez, E. J. Salumbides +1
High-precision two-photon Doppler-free frequency measurements have been performed on the CO A - X fourth-positive system (2,0), (3,0), and (4,0) bands. Absolute frequen…
H Lyman and Werner band lines and their sensitivity for a variation of the proton-electron mass ratio in the gravitational potential of white dwarfs
E. J. Salumbides, J. Bagdonaite, H. Abgrall +2
Recently an accurate analysis of absorption spectra of molecular hydrogen, observed with the Cosmic Origins Spectrograph aboard the Hubble Space Telescope, in the photosphere of wh…
The inhomogeneous ISM toward PKS1830-211 SW - A detailed view on molecular gas at a look-back time of 7.5 Gyr
A. Schulz, C. Henkel, K. M. Menten +4
Based on measurements with the Effelsberg 100-m telescope, a multi-line study of molecular species is presented toward the south-western source of the gravitational lens system PKS…
Effect of soil temperature on one-way optical frequency transfer through dense-wavelength-division-multiplexing fibre links
T. J. Pinkert, O. Böll, G. S. M. Jansen +8
Results of optical frequency transfer over a carrier-grade dense-wavelength-division-multiplexing (DWDM) optical fibre network are presented. The relation between soil temperature…
and level energies of D
E. J. Salumbides, D. Bailly, M. Vervloet +1
Accurate absolute level energies of the , and , rovibrational quantum states of molecular deuterium are derived by combini…
Limits on a Gravitational Field Dependence of the Proton--Electron Mass Ratio from H in White Dwarf Stars
Julija Bagdonaite, Edcel J. Salumbides, Simon P. Preval +4
Spectra of molecular hydrogen (H) are employed to search for a possible proton-to-electron mass ratio () dependence on gravity. The Lyman transitions of H, observed with…
Ramsey-type microwave spectroscopy on CO ()
A. J. de Nijs, W. Ubachs, H. L. Bethlem
Using a Ramsey-type setup, the lambda-doublet transition in the level of the state of CO was measured to be 394 064 870(10) Hz. In our molecular beam apparatus,…