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  • W.M.G. Ubachs
2011

A high-velocity narrow absorption line outflow in the quasar J212329.6-005052.9

Hamann, F., Kanekar, N., Prochaska, J. X., Murphy, M. T., Ellison, S. L., Malec, A. L., Milutinovic, N. & Ubachs, W. M. G., 2011, In : Monthly Notices of the Royal Astronomical Society. 410, p. 1957-1974

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access
File

C6H and C6D: electronic spectra and Renner-Teller analysis

Zhao, D., Haddad, M. A., Linnartz, H. V. J. & Ubachs, W. M. G., 2011, In : Journal of Chemical Physics. 135, p. 044307 044307.

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access
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Direct frequency comb spectroscopy in trapped 40Ca + ions on a dipoleforbidden clock transition

Wolf, A. L., Morgenweg, J., Koelemeij, J. C. J., Van Den Berg, S. A., Ubachs, W. & Eikema, K. S. E., 2011, 2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011. 5943528

Research output: Chapter in Book / Report / Conference proceedingConference contributionAcademicpeer-review

Direct frequency-comb spectroscopy of a dipole-forbidden clock transition in trapped 40Ca+ ions

Wolf, A. L., Morgenweg, J., Koelemeij, J. C. J., van den Berg, S. A., Ubachs, W. M. G. & Eikema, K. S. E., 2011, In : Optics Letters. 36, 1, p. 49-51 3 p.

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access
File

Electronic spectra and structure of the non-linear carbon chain C9H3

Zhao, D., Wehres, N., Linnartz, H. V. J. & Ubachs, W. M. G., 2011, In : Chemical Physics Letters. 501, p. 232-237

Research output: Contribution to JournalArticleAcademicpeer-review

First Constraint on Cosmological Variation of the Proton-to-Electron Mass Ratio from Two Independent Telescopes

van Weerdenburg, F., Murphy, M. T., Malec, A. L., Kaper, L. & Ubachs, W. M. G., 2011, In : Physical Review Letters. 106, 18, p. 180802

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access
File

Frequency comb metrology at PHz frequencies: Precision in the extreme ultraviolet

Gohle, C., Kandula, D. Z., Pinkert, T. J., Morgenweg, J., Barmes, I., Ubachs, W. & Eikema, K. S. E., 2011, 2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011. 6050328

Research output: Chapter in Book / Report / Conference proceedingConference contributionAcademicpeer-review

Frequency comb metrology in the extreme ultraviolet

Kandula, D. Z., Gohle, C., Pinkert, T. J., Morgenweg, J., Barmes, I., Ubachs, W. & Eikema, K. S. E., 2011, 2011 Conference on Lasers and Electro-Optics: Laser Science to Photonic Applications, CLEO 2011. 5950371

Research output: Chapter in Book / Report / Conference proceedingConference contributionAcademicpeer-review

High precision frequency measurement of the 423 nm Ca I line

Salumbides, E. J., Maslinskas, V., Dildar, I. M., Wolf, A. L., van Duijn, E. J., Eikema, K. S. E. & Ubachs, W. M. G., 2011, In : Physical Review A. 83, p. 012502

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access
File

High resolution Fourier-transform extreme ultraviolet photoabsorption spectroscopy of 14N15N

Heays, A. N., Dickenson, G. D., Salumbides, E. J., de Oliveira, N., Joyeux, D., Nahon, L., Lewis, B. R. & Ubachs, W. M. G., 2011, In : Journal of Chemical Physics. 135, 24, p. 244301

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access
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Methanol as a Sensitive Probe for Spatial and Temporal Variations of the Proton-to-Electron Mass Ratio

Jansen, P., Xu, L-H., Kleiner, I., Ubachs, W. M. G. & Bethlem, H. L., 2011, In : Physical Review Letters. 106, 10, p. 100801

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access
File

New constraint on cosmological variation of the proton-to-electron mass ratio from Q0528-250

King, J. A., Murphy, M. T., Ubachs, W. M. G. & Webb, J. K., 2011, In : Monthly Notices of the Royal Astronomical Society. 417, p. 3010-3024 15 p.

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access
File

QED Effects in Molecules: Test on Rotational Quantum States of H(2)

Salumbides, E. J., Dickenson, G. D., Ivanov, T. I. & Ubachs, W. M. G., 2011, In : Physical Review Letters. 107, 4, p. 043005

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access
File

Search for cosmological mu variation form high-redshift H2 absorption; a status report

Ubachs, W. M. G., Bagdonaite, J., Murphy, M. T., Buning, R. & Kaper, L., 2011, From Varying Couplings to Fundamental Physics. Martins, C. & Molaro, P. (eds.). Berlin-Heidelberg: Springer, p. 125 (Astrophysics and Space Science Proceedings).

Research output: Chapter in Book / Report / Conference proceedingChapterAcademicpeer-review

File

Search for cosmological μ-variation from high-redshift H2 absorption; a status report

Ubachs, W., Bagdonaite, J., Murphy, M. T., Buning, R. & Kaper, L., 2011, From Varying Couplings to Fundamental Physics - Proceedings of Symposium 1 of JENAM 2010. Kluwer Academic Publishers., p. 125-137 13 p.

Research output: Chapter in Book / Report / Conference proceedingConference contributionAcademicpeer-review

Sensitivity of transitions in internal rotor molecules to a possible variation of the proton-to-electron mass ratio

Jansen, P., Kleiner, I., Xu, L-H., Ubachs, W. M. G. & Bethlem, H. L., 2011, In : Physical Review A. 84, 6, 06250584.

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access
File

Spectral identification of diffuse resonances in H2 above the n=2 dissociation limit

Ivanov, T. I., de Lange, C. A. & Ubachs, W. M. G., 2011, In : Journal of Chemical Physics. 134, p. 054309 10 p.

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access
File

Structure determination of the non-linear hydrocarbon chains C9H3 and C11H3 by deuterium labeling

Zhao, D., Haddad, M. A., Linnartz, H. V. J. & Ubachs, W. M. G., 2011, In : Journal of Chemical Physics. 135, p. 074201 074201.

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access
File

The pancharatnam-berry phase for non-cyclic polarization changes

Van Dijk, T., Schouten, H. F., Ubachs, W. & Visser, T. D., 2011, Frontiers in Optics, FiO 2011.

Research output: Chapter in Book / Report / Conference proceedingConference contributionAcademicpeer-review

Towards measuring the ionisation and dissociation energies of molecular hydrogen with sub-MHz accuracy

Sprecher, D., Jungen, C., Ubachs, W. M. G. & Merkt, F., 2011, In : Faraday Discussions. 150, p. 51-70

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access
File

UV frequency metrology on CO (a3P); Isotope effects and sensitivity to a variation of the proton-to-elelctron mass ratio

de Nijs, A. J., Salumbides, E. J., Eikema, K. S. E., Ubachs, W. M. G. & Bethlem, H. L., 2011, In : Physical Review A. 84, 12 p., 052509.

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access
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VUV spectroscopic study of the D1Piu state of molecular deuterium

Dickenson, G. D., Ivanov, T. I., Ubachs, W. M. G., Roudjane, M., de Oliveira, N., Joyeux, D., Nahon, L., Tchang-Brillet, W. U. L., Glass-Maujean, M., Schmoranzer, H., Knie, H., Kubler, S. & Ehresmann, A., 2011, In : Molecular Physics. 109, 22, p. 2396-2708

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access
File

Widely tunable extreme ultraviolet frequency comb generation

Pinkert, T. J., Kandula, D. Z., Gohle, C., Morgenweg, J., Barmes, I., Ubachs, W. & Eikema, K. S. E., 2011, 2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011. 5943518

Research output: Chapter in Book / Report / Conference proceedingConference contributionAcademicpeer-review

XUV frequency comb metrology on the ground state of helium

Kandula, D. Z., Gohle, C., Pinkert, T. J., Ubachs, W. M. G. & Eikema, K. S. E., 2011, In : Physical Review A. 84, 6, 062512.

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access
File
2013

A stringent limit on a drifting proton-to-electron mass ratio from alcohol in the early Universe

Bagdonaite, J., Jansen, P., Henkel, C., Bethlem, H. L., Menten, K. & Ubachs, W. M. G., 2013, In : Science. 339, 6115, p. 46-48 3 p.

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access
File

Bounds on fifth forces from precision measurements on molecules

Salumbides, E. J., Koelemeij, J. C. J., Komasa, J., Pachucki, K., Eikema, K. S. E. & Ubachs, W. M. G., 2013, In : Physical Review D. 87, 11, 112008.

Research output: Contribution to JournalArticleAcademicpeer-review

Dynamic beam steering from a sub-wavelength slit by selective excitation of guided modes

Raghunathan, S. B., Schouten, H., Ubachs, W. M. G., Kim, E., Gan, C. H. & Visser, T. D., 2013, In : Physical Review Letters. 111, 15, 153901.

Research output: Contribution to JournalArticleAcademicpeer-review

Fundamental vibration of molecular hydrogen.

Dickenson, G. D., Niu, M., Salumbides, E. J., Komasa, J., Eikema, K. S. E., Pachucki, K. & Ubachs, W. M. G., 2013, In : Physical Review Letters. 110, 19, p. 193601

Research output: Contribution to JournalArticleAcademicpeer-review

High resolution spectroscopy and perturbation analysis of the CO A1Π -X1Σ+ (0,0) and (1,0) bands

Niu, M., Salumbides, E. J., Zhao, D., de Oliveira, N., Joyeux, D., Nahon, L., Field, R. W. & Ubachs, W. M. G., 2013, In : Molecular Physics. 111, 14-15, p. 2163-214-74

Research output: Contribution to JournalArticleAcademicpeer-review

Laser cooling of beryllium ions using a frequency-doubled 626 nm diode laser

Cozijn, F. M. J., Biesheuvel, J., Flores, A. S., Ubachs, W. M. G., Blume, G., Wicht, A., Paschke, K., Erbert, G. & Koelemeij, J. C. J., 2013, In : Optics Letters. 38, 13, p. 2370-2372

Research output: Contribution to JournalArticleAcademicpeer-review

Methyl mercaptan (CH3SH) as a probe for variation of the proton-to-electron mass ratio

Jansen, P., Xu, L. H., Kleiner, I., Bethlem, H. L. & Ubachs, W. M. G., 2013, In : Physical Review A. 87, 5, 052509.

Research output: Contribution to JournalArticleAcademicpeer-review

Optomechanical Shutter Modulated Broad-Band Cavity−Enhanced Absorption Spectroscopy of Molecular Transients of Astrophysical Interest

Walsh, A., Zhao, D., Ubachs, W. M. G. & Linnartz, H. V. J., 2013, In : Journal of Physical Chemistry A.

Research output: Contribution to JournalArticleAcademicpeer-review

Photodissociation of interstellar N2

Li, X., Heays, A. N., Visser, R., Ubachs, W. M. G., Lewis, B. R., Gibson, S. T. & van Dishoeck, E. F., 2013, In : Astronomy and Astrophysics. 555, 18 p., A14.

Research output: Contribution to JournalArticleAcademicpeer-review

Precision metrology on the hydrogen atom in search for new physics

Ubachs, W. M. G., Vassen, W., Salumbides, E. J. & Eikema, K. S. E., 2013, In : Annalen der Physik. 525, 7, p. A113-a115

Research output: Contribution to JournalArticleAcademicpeer-review

Prospects for high-resolution microwave spectroscopy of methanol in a Stark-deflected molecular beam

Jansen, P., Kleiner, I., Meng, C., Lees, R., Janssen, M. H. M., Ubachs, W. M. G. & Bethlem, H. L., 2013, In : Molecular Physics. 111, 12-13, p. 1923-1930

Research output: Contribution to JournalArticleAcademicpeer-review

Rayleigh-Brillouin scattering profiles of air at different temperatures and pressures

Gu, Z., Witschas, B., van der Water, W. & Ubachs, W. M. G., 2013, In : Applied Optics. 52, 19, p. 4640-51

Research output: Contribution to JournalArticleAcademicpeer-review

Robust Constraint on a Drifting Proton-to-Electron Mass Ratio at z=0: 89 from Methanol Observation at Three Radio Telescopes

Bagdonaite, J., Dapra, M., Jansen, P., Bethlem, H. L., Ubachs, W. M. G., Muller, S., Henkel, C. & Menten, K. M., 2013, In : Physical Review Letters. 111, 23, 231101.

Research output: Contribution to JournalArticleAcademicpeer-review

Temperature-dependent bulk viscosity of nitrogen gas determined from spontaneous Rayleigh-Brillouin scattering

Gu, Z. & Ubachs, W. M. G., 2013, In : Optics Letters. 38, 7, p. 1110-2

Research output: Contribution to JournalArticleAcademicpeer-review

Testing the mass-scaling relations in the a3P state of 12C18O and 13C16O

de Nijs, A. J., Zhao, D., Bethlem, H. L., Linnartz, H. V. J. & Ubachs, W. M. G., 2013, In : Journal of Molecular Spectroscopy. 292, p. 20-22

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access
File

The H2 molecule; test of QED and varying constants

Ubachs, W., 2013, Laser Science, LS 2013. Optical Society of America

Research output: Chapter in Book / Report / Conference proceedingConference contributionAcademicpeer-review

Widely tunable laser frequency offset lock with 30 GHz range and 5 THz offset

Biesheuvel, J., Noom, D. W. E., Salumbides, E. J., Sheridan, K. T., Ubachs, W. M. G. & Koelemeij, J. C. J., 2013, In : Optics Express. 21, 12, p. 14008-14016

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access
File
2014

ANALYSIS OF MOLECULAR HYDROGEN ABSORPTION TOWARD QSO B0642-5038 FOR A VARYING PROTON-TO-ELECTRON MASS RATIO

Bagdonaite, J., Ubachs, W. M. G., Murphy, M. T. & Whitmore, J. B., 2014, In : Astrophysical Journal. 782, 1, 10.

Research output: Contribution to JournalArticleAcademicpeer-review

Analysis of Rayleigh-Brillouin spectral profiles and Brillouin shifts in nitrogen gas and air

Ma, Y., Li, H., Gu, Z., Ubachs, W. M. G., Yu, Y., Huang, J., Zhou, B., Wang, Y. & Liang, K., 2014, In : Optics Express. 22, 2, p. 2092-2104

Research output: Contribution to JournalArticleAcademicpeer-review

A systematic study of Rayleigh-Brillouin scattering in air, N-2, and O-2 gases

Gu, Z. & Ubachs, W. M. G., 2014, In : Journal of Chemical Physics. 141, 10, 104320.

Research output: Contribution to JournalArticleAcademicpeer-review

B1Su+ and EF1Sg+ level energies of D2

Salumbides, E. J., Bailly, D., Vervloet, M. & Ubachs, W. M. G., 2014, In : Journal of Molecular Spectroscopy. 305, p. 34-39

Research output: Contribution to JournalArticleAcademicpeer-review

Bounds on fifth forces at the sub-angstrom length scale

Salumbides, E. J., Ubachs, W. M. G. & Korobov, V. I., 2014, In : Journal of Molecular Spectroscopy. 300, SI, p. 65-69

Research output: Contribution to JournalArticleAcademicpeer-review

Broadband cavity enhanced absorption spectroscopy: A new approach to search for DIB carriers

Walsh, A. J., Zhao, D., Ubachs, W. & Linnartz, H., Feb 2014, In : Proceedings of the International Astronomical Union. 9, S297, p. 281-285 5 p.

Research output: Contribution to JournalArticleAcademicpeer-review

H2 as a possible carrier of the DIBs?

Ubachs, W., Feb 2014, In : Proceedings of the International Astronomical Union. 9, S297, p. 375-377 3 p.

Research output: Contribution to JournalArticleAcademicpeer-review

Introduction to the Special issue Spectroscopic Tests of Fundamental Physics

Steimle, T. & Ubachs, W. M. G., 2014, In : Journal of Molecular Spectroscopy. 300, SI, p. 1-2 2 p.

Research output: Contribution to JournalArticleAcademicpeer-review

Isotope selective photodissociation of N-2 by the interstellar radiation field and cosmic rays

Heays, A. N., Visser, R., Gredel, R., Ubachs, W. M. G., Lewis, B. R., Gibson, S. T. & van Dishoeck, E. F., 2014, In : Astronomy and Astrophysics. 562, A61.

Research output: Contribution to JournalArticleAcademicpeer-review