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  • W.M.G. Ubachs
2017

Analysis of carbon monoxide absorption at zabs ≃ 2.5 to constrain variation of the proton-to-electron mass ratio

Dapra, M., Noterdaeme, P., Vonk, M., Murphy, M. T. & Ubachs, W., 7 Feb 2017, In : Monthly Notices of the Royal Astronomical Society. 467, 4, p. 3848-3855 8 p.

Research output: Contribution to JournalArticleAcademicpeer-review

C-60(+) and the Diffuse Interstellar Bands: An Independent Laboratory Check

Spieler, S., Kuhn, M., Postler, J., Simpson, M., Wester, R., Scheier, P., Ubachs, W., Bacalla, X., Bouwman, J. & Linnartz, H., 10 Sep 2017, In : Astrophysical Journal. 846, 2, 168.

Research output: Contribution to JournalArticleAcademicpeer-review

CARS spectroscopy of the (v=0→1) band in T2

Schlösser, M., Zhao, X., Trivikram, M., Ubachs, W. & Salumbides, E. J., Sep 2017, In : Journal of Physics B: Atomic, Molecular and Optical Physics. 50, 21, 214004.

Research output: Contribution to JournalArticleAcademicpeer-review

Constraint on a varying proton-to-electron mass ratio from H2 and HD absorption at zabs ≃ 2.34

Daprà, M., Laan, M., Murphy, M. T. & Ubachs, W., 2017, In : Monthly Notices of the Royal Astronomical Society. 465, 4, p. 4057-4073 17 p.

Research output: Contribution to JournalArticleAcademicpeer-review

Discovery of a Perseus-like cloud in the early Universe: H I-to-H 2 transition, carbon monoxide and small dust grains at z abs ≈ 2.53 towards the quasar J0000+0048

Noterdaeme, P., Krogager, J. K., Balashev, S., Ge, J., Gupta, N., Krühler, T., Ledoux, C., Murphy, M. T., Pâris, I., Petitjean, P., Rahmani, H., Srianand, R. & Ubachs, W., 1 Jan 2017, In : Astronomy and Astrophysics. 597, A82.

Research output: Contribution to JournalArticleAcademicpeer-review

Experimental and theoretical studies of the nps 1Su+ and nppi 1Pu+ (n >= 4, N'=1-6) states of D2: energies, natural widths, absorption line intensities, and dynamics

Glass-Maujean, M., Jungen, C., Vasserot, A. M., Schmoranzer, H., Knie, A., Kübler, S., Ehresmann, A. & Ubachs, W., 23 May 2017, In : Journal of Molecular Spectroscopy. 338, p. 22-71 50 p.

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access

Fourier-transform spectroscopy of 13C17O and deperturbation analysis of the A1Π (υ=0–3) levels

Hakalla, R., Niu, M. L., Field, R. W., Heays, A. N., Salumbides, E. J., Stark, G., Lyons, J. R., Eidelsberg, M., Lemaire, J. L., Federman, S. R., de Oliveira, N. & Ubachs, W., 1 Mar 2017, In : Journal of Quantitative Spectroscopy and Radiative Transfer. 189, p. 312-328 17 p.

Research output: Contribution to JournalArticleAcademicpeer-review

High-precision spectroscopy of the HD+ molecule at the 1-p.p.b. level

Biesheuvel, J., Karr, J. P., Hilico, L., Eikema, K. S. E., Ubachs, W. & Koelemeij, J. C. J., 1 Jan 2017, In : Applied Physics B. Lasers and Optics. 123, 1, 23.

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access

Ion distribution and ablation depth measurements of a fs-ps laser-irradiated solid tin target

Deuzeman, M. J., Stodolna, A. S., Leerssen, E. E. B., Antoncecchi, A., Spook, N., Kleijntjens, T., Versluis, J., Witte, S., Eikema, K. S. E., Ubachs, W., Hoekstra, R. & Versolato, O. O., 14 Mar 2017, In : Journal of Applied Physics. 121, 10, 103301.

Research output: Contribution to JournalArticleAcademicpeer-review

Optical spectroscopy of complex open 4d-shell ions Sn7+ - Sn10+

Torretti, F., Windberger, R. A. W., Ryabtsev, A., Dobrodey, S., Bekker, H., Ubachs, W., Hoekstra, R., Kahl, E. V., Berengut, J. C., Crespo López-Urrutia, J. R. & Versolato, O., 10 Apr 2017, In : Physical Review A. 95, 4, 042503.

Research output: Contribution to JournalArticleAcademicpeer-review

Perturbations in the A1Π, v = 0 state of 12C18O investigated via complementary spectroscopic techniques

Trivikram, M., Hakalla, R., Heays, A. N., Niu, M., Scheidegger, S., Salumbides, E. J., de Oliveira, N., Field, R. W. & Ubachs, W., 4 Aug 2017, In : Molecular Physics. 115, 24, p. 3178-3191 14 p.

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access

Probing the Gravitational Dependence of the Fine-Structure Constant from Observations of White Dwarf Stars

Bainbridge, M. B., Barstow, M. A., Reindl, N., Tchang-Brillet, W. -U. L., Ayres, T. R., Webb, J. K., Barrow, J. D., Hu, J., Holberg, J. B., Preval, S. P., Ubachs, W., Dzuba, V. A., Flambaum, V. V., Dumont, V. & Berengut, J. C., Jun 2017, In : UNIVERSE. 3, 2, 32.

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access

Rayleigh-Brillouin scattering in SF6 in the kinetic regime

Wang, Y., Yu, Y., Liang, K., Marques, W., van de Water, W. & Ubachs, W., 1 Feb 2017, In : Chemical Physics Letters. 669, p. 137-142 6 p.

Research output: Contribution to JournalArticleAcademicpeer-review

Testing the variability of the proton-to-electron mass ratio from observations of methanol in the dark cloud core L1498

Dapra, M., Henkel, C., Levshakov, S. A., Menten, K. M., Muller, S., Bethlem, H. L., Leurini, S., Lapinov, A. V. & Ubachs, W., Dec 2017, In : Monthly Notices of the Royal Astronomical Society. 472, 4, p. 4434-4443 10 p.

Research output: Contribution to JournalArticleAcademicpeer-review

2016

Analysis of the fine structure of Sn11+-Sn14+ ions by optical spectroscopy in an electron-beam ion trap

Windberger, A., Torretti, F., Borschevsky, A., Ryabtsev, A., Dobrodey, S., Bekker, H., Eliav, E., Kaldor, U., Ubachs, W. M. G., Hoekstra, R., Lopez-Urrutia, J. R. C. & Versolato, O. O., 2016, In : Physical Review A. 94, 1, 012506.

Research output: Contribution to JournalArticleAcademicpeer-review

A testing time for antimatter

Ubachs, W., 4 Nov 2016, In : Science. 354, 6312, p. 546-547 2 p.

Research output: Contribution to JournalShort surveyAcademicpeer-review

Colloquium: Search for a drifting proton-electron mass ratio from H-2

Ubachs, W. M. G., Bagdonaite, J., Salumbides, E. J., Murphy, M. T. & Kaper, L., 2016, In : Reviews of Modern Physics. 88, 2, 021003.

Research output: Contribution to JournalArticleAcademicpeer-review

constraint on a cosmological variation in the proton-to-electron mass ratio from electronic co absorption

Dapra, M., Niu, M., Salumbides, E. J., Murphy, M. T. & Ubachs, W. M. G., 2016, In : Astrophysical Journal. 826, 2, 192.

Research output: Contribution to JournalArticleAcademicpeer-review

Molecular Fountain

Cheng, C., van der Poel, A. P. P., Jansen, P., Quintero Perez, M., Wall, T. E., Ubachs, W. M. G. & Bethlem, H. L., 2016, In : Physical Review Letters. 117, 25, 5 p., 253201.

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access
File

Physics beyond the Standard Model from hydrogen spectroscopy

Ubachs, W. M. G., Koelemeij, J. C. J., Eikema, K. S. E. & Salumbides, E. J., 2016, In : Journal of Molecular Spectroscopy. 320, p. 1-12

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access

Plasma Propulsion of a Metallic Microdroplet and its Deformation upon Laser Impact

Kurilovich, D., Klein, A. L., Torretti, F., Lassise, A., Hoekstra, R., Ubachs, W. M. G., Gelderblom, H. & Versolato, O., 2016, In : Physical Review Applied. 6, 1, 014018.

Research output: Contribution to JournalArticleAcademicpeer-review

Precision measurements and test of molecular theory in highly excited vibrational states of H2 (v = 11)

Trivikram, T. M., Niu, M. L., Wcisło, P., Ubachs, W. & Salumbides, E. J., 1 Dec 2016, In : Applied Physics B. Lasers and Optics. 122, 12, 294.

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access

Probing QED and fundamental constants through laser spectroscopy of vibrational transitions in HD

Biesheuvel, J., Karr, J-P., Hilico, L., Eikema, K. S. E., Ubachs, W. M. G. & Koelemeij, J. C. J., 2016, In : Nature Communications. 7, 10385.

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access

Spectroscopic Survey of Electronic Transitions of C6H, (C6H)-C-13, and C6D

Bacalla, X. L., Salumbides, E. J., Linnartz, H. V. J., Ubachs, W. M. G. & Zhao, D., 2016, In : Journal of Physical Chemistry A. 120, 32, p. 6402-6417

Research output: Contribution to JournalArticleAcademicpeer-review

Spectroscopy and perturbation analysis of the A1π (v=0) state of 13 C16 O

Niu, M. L., Hakalla, R., Trivikram, T. M., Heays, A. N., de Oliveira, N., Salumbides, E. J. & Ubachs, W., 1 Oct 2016, In : Molecular Physics. 114, 19, p. 2857-2867 11 p.

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access

Spectroscopy and perturbation analysis of the CO A(1)pi -X-1 sigma(+) (2,0), (3,0) and (4,0) bands

Niu, M., Salumbides, E. J., Heays, A. N., de Oliveira, N., Field, R. W. & Ubachs, W. M. G., 2016, In : Molecular Physics. 114, 5, p. 627-636

Research output: Contribution to JournalArticleAcademicpeer-review

The excited J=0 (1)Sigma(+)(u) levels of D-2: Measurements and ab initio quantum defect study

Glass-Maujean, M., Jungen, C., Dickenson, G. D., de Oliveira, N. & Ubachs, W. M. G., 2016, In : Journal of Molecular Spectroscopy. 320, p. 33-38

Research output: Contribution to JournalArticleAcademicpeer-review

The Measurement of Tropospheric Temperature Profiles using Rayleigh-Brillouin Scattering: Results from Laboratory and Atmospheric Studies

Witschas, B., Reitebuch, O., Lemmerz, C., Kableka, P. G., Kondratyev, S., Gu, Z. & Ubachs, W., 7 Jun 2016, In : EPJ Web of Conferences. 119, 27004.

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access

VIS and VUV spectroscopy of (CO)-C-12-O-17 and deperturbation analysis of the A(1)II, nu=1-5 levels

Hakalla, R., Niu, M., Field, R. W., Salumbides, E. J., Heays, A. N., Stark, G., Lyons, J. R., Eidelsberg, M., Lemaire, J. L., Federman, S., Zachwieja, M., Szajna, W., Kolek, P., Piotrowska, I., Ostrowska-Kopec, M., Kepa, R., de Oliveira, N. & Ubachs, W. M. G., 2016, In : RSC Advances. 6, 38, p. 31588-31606

Research output: Contribution to JournalArticleAcademicpeer-review

Open Access
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

Limits on a gravitational field dependence of the proton-electron mass ratio from h_{2} in white dwarf stars.

Bagdonaite, J., Salumbides, E. J., Preval, S. P., Barstow, M. A., Barrow, J. D., Murphy, M. T. & Ubachs, W. M. G., 2014, In : Physical Review Letters. 113, 12, 123002.

Research output: Contribution to JournalArticleAcademicpeer-review

Novel techniques in VUV high-resolution spectroscopy

Ubachs, W. M. G., Salumbides, E. J., Eikema, K. S. E., de Oliveira, N. & Nahon, L., 2014, In : Journal of Electron Spectroscopy and Related Phenomena. 196, p. 159-164

Research output: Contribution to JournalArticleAcademicpeer-review

Perspective: Tipping the scales: Search for drifting constants from molecular spectra

Jansen, P., Bethlem, H. L. & Ubachs, W. M. G., 2014, In : Journal of Chemical Physics. 140, 1, 010901.

Research output: Contribution to JournalArticleAcademicpeer-review

Precision spectroscopy of the X-1 Sigma(+)(g), v=0 -> 1(J=0-2) rovibrational splittings in H-2, HD and D-2

Niu, M., Salumbides, E. J., Dickenson, G. D., Eikema, K. S. E. & Ubachs, W. M. G., 2014, In : Journal of Molecular Spectroscopy. 300, SI, p. 44-54

Research output: Contribution to JournalArticleAcademicpeer-review

Ramsey-type microwave spectroscopy on CO (alpha(3) II)

de Nijs, A. J., Ubachs, W. M. G. & Bethlem, H. L., 2014, In : Journal of Molecular Spectroscopy. 300, SI, p. 79-85

Research output: Contribution to JournalArticleAcademicpeer-review

Rayleigh-Brillouin scattering of carbon dioxide

Gu, Z., Ubachs, W. M. G. & van der Water, W., 2014, In : Optics Letters. 39, 11, p. 3301-3304

Research output: Contribution to JournalArticleAcademicpeer-review

Rotationally resolved spectra of the 4051 angstrom comet band of C-3 for all six C-12 and C-13 isotopologues

Haddad, M. A., Zhao, D., Linnartz, H. V. J. & Ubachs, W. M. G., 2014, In : Journal of Molecular Spectroscopy. 297, p. 41-50

Research output: Contribution to JournalArticleAcademicpeer-review

Temperature retrieval from Rayleigh-Brillouin scattering profiles measured in air

Witschas, B. & Ubachs, W. M. G., 2014, In : Optics Express. 22, 24, p. 29655-29667

Research output: Contribution to JournalArticleAcademicpeer-review

The 4051 Å comet band of 13C3

Haddad, M. A., Zhao, D., Linnartz, H. & Ubachs, W., Feb 2014, In : Proceedings of the International Astronomical Union. 9, S297, p. 297-299 3 p.

Research output: Contribution to JournalArticleAcademicpeer-review

VUV spectroscopic study of the B '' (B)over-bar(1) Sigma(+)(u) state of H-2

Dickenson, G. D. & Ubachs, W. M. G., 2014, In : Molecular Physics. 112, 8, p. 1089-1093

Research output: Contribution to JournalArticleAcademicpeer-review

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