UBACHS, WIM / Fisica / Investigadores

Centro Internacional de Investigación Científica

Investigadores

Fisica / UBACHS, WIM

wimunat.vu.nl

Puesto

Professor of Atomic, Molecular and Laser Physics
Director of Laser Centre Vrije Universiteit, Amsterdam, The Netherlands.

Activities in the Atomic and Laser Physics group concentrate on several main research topics. Within each category several projects are executed. In all of these projects state-of-the-art laser systems play an essential role. This research forms part of the research activities within the Laser Centre of the University.

- Metrology studies and time variation of fundamental constants
o Laboratory studies for probing a variation of alpha
o A temporal change in the proton-electron mass ratio: Mp/me ?
o A molecular fountain

- Cold Atoms
o BEC in Helium 4
o Helium 3 Cooling
o Nanolithography with Triplet Helium
o Scaled Energy Spectroscopy

- XUV Laser
o Predissociation of Molecular Nitrogen
o Hydrogen
o Lamb Shift
o Carbon Monoxide

- Ultrafast physics
o X-ray generation
o Frequency-Comb Femtosecond Spectroscopy

- Cavity Ring down spectroscopy
o CRD for detection of carbon-containing species in plasma discharges
o CRD and sensitive detection in liquid chromatography

- Applied Spectroscopy
o Spectroscopic Studies for Laser Isotope Separation of Isotopes for medical applications
o Construction of Optical Parametric Oscillators

- Atmospheric Physics (by prof. E.E.A. Aben - in collaboration with SRON)
o Satellite remote sensing of the Earth's Atmosphere

W. Ubachs, R. Buning, E.J. Salumbides, S. Hannemann, H.L. Bethlem, D. Bailly, M. Vervloet, L. Kaper, M.T. Murphy
On a variation of the proton-electron mass ratio
Proceedings of the International Conference on Laser Spectroscopy 2007

S. Hannemann, E.-J. van Duijn, W. Ubachs,
A narrow-band injection-seeded pulsed titanium:sapphire oscillator-amplifier system with on-line chirp analysis for high-resolution spectroscopy
submitted (2007)

W. Ubachs, R. Buning, K.S.E. Eikema, E. Reinhold,
On a possible variation of the proton-electron mass ratio; H2 spectra in the line of sight of high-redshift quasars and in the laboratory
J. Mol. Spectr. 241 (2007) 155-179

M.O. Vieitez, T.I. Ivanov, J.P. Sprengers, C.A. de Lange, W. Ubachs, B.R. Lewis, G. Stark
Quantum-interference effects in the o1Pu(v=1) - b1Pu(v=9) Rydberg-valence complex of molecular nitrogen
Mol. Phys. 105 (2007) 1543-1557

S. Hannemann, E.J. Salumbides, W. Ubachs,
Reducing the first order Doppler shift in a Sagnac interferometer
Optics Lett. 32 (2007) 1381-1383

L. van der Sneppen, F. Ariese, C. Gooijer, W. Ubachs,
Cavity ring-down spectroscopy for detection in liquid chromatography at UV wavelengths using standard cuvettes in a zero-degree geometry
J. Chromatogr. A 1148 (2007) 184-188

E. Reinhold, R. Buning, U. Hollenstein, A. Ivanchik, P. Petitjean, W. Ubachs,
Indication of a cosmological variation of the proton-electron mass ratio based on laboratory measurement and reanalysis of H2 spectra
Phys. Rev. Lett. 96 (2006) 151101
Supplementary Material to the paper: EPAPS

W. Ubachs, R. Buning, E. Reinhold,
Is er toch variatie van Natuurconstanten ?
Ned. Tijdschr. v. Natuurk. 72 (2006) 184-185.

S. Hannemann, E.J. Salumbides, S. Witte, R. Zinkstok, E.-J. van Duijn, K.S.E. Eikema, W. Ubachs,
Frequency metrology on the EF1S+g- X1S+g transition in H2, HD and D2
Phys. Rev. A 74, 062514 (2006).
This paper also appeared in the Virtual Journal of Ultrafast Science

W. Ubachs
Precision spectroscopy of H2 and a possible variation of mp/me over cosmological time
AIP Conf. Prod. 869, 37 (2006).

E.J. Salumbides, S. Hannemann, K.S.E. Eikema, W. Ubachs,
Isotopically-resolved calibration of the 285-nm Mg I resonance line for comparison with quasar absorptions
Mon. Notices Roy. Astron. Soc. 373 (2006) L41-L44

S. Witte, R. Th. Zinkstok, A.L. Wolf, W. Hogervorst, W. Ubachs, K.S.E. Eikema,
A source of 2 terawatt, 2.7 cycle laser pulses based on noncollinear optical parametric chirped amplification
Opt. Express 14, 8168-8177 (2006)
This paper also appeared in the Virtual Journal of Ultrafast Science

S. Hannemann, E.J. Salumbides, S. Witte, R. Zinkstok, E.-J. van Duijn, K.S.E. Eikema, W. Ubachs,
Frequency metrology on the Mg 3s2 - 3s4p line for comparison with quasar data
Phys. Rev. A 74, 012505 (2006).

R.T. Zinkstok, S. Witte, W. Ubachs, W. Hogervorst, K.S.E. Eikema,
Frequency comb metrology laser spectroscopy in the vacuum ultraviolet
Phys. Rev. A 73, 061801(R) (2006)
This paper also appeared in the Virtual Journal of Ultrafast Science

L. van der Sneppen, A.E. Wiskerke, F. Ariese, C. Gooijer, W. Ubachs,
Cavity ring-down spectroscopy for detection in liquid chromatography : extension to tunable sources and UV wavelengths
Appl. Spectr. 60, 931-935 (2006)

E.J. Salumbides, K.S.E. Eikema, W. Ubachs, U. Hollenstein, H. Knoeckel, E. Tiemann,
The hyperfine structure of 129I2 and 127I129I in the B3Pu - X1Sg band system
Mol. Phys. 104, 2641-2652 (2006)

O. Naumenko, M. Sneep, M. Tanaka, S.V. Shirin, W. Ubachs, J. Tennyson,
Cavity ring-down spectroscopy of H217O in the range 16570 -17125 cm-1
Supplementary Material
J. Mol. Spectr. 237, 63-69 (2006)

U. Hollenstein, E. Reinhold, C.A. de Lange, W. Ubachs,
High resolution VUV-laser spectroscopic study of the B1S(u)+ (v') - X1S(g)+ (0), v'=0-2 Lyman bands in H2 and HD
J. Phys. B. 39 (2006) L195-L201

F. Brandi, F. Giammanco, W. Ubachs
Spectral redshift in harmonic generation from plasma dynamics in the laser focus
Phys. Rev. Lett. 96 (2006) 123904
This paper also appeared in the Virtual Journal of Ultrafast Science

L. van der Sneppen, A.E. Wiskerke, F. Ariese, C. Gooijer, W. Ubachs,
Improving absorbance detection in Liquid Chromatography with Cavity Ring-Down spectroscopy
Anal. Chim. Acta 558 (2006) 2-6

J.P. Sprengers, W. Ubachs,
Lifetimes and transition frequencies of several singlet ungerade states in N2 between 100000 - 106000 cm-1
J. Mol. Spectr. 235 (2006) 176-180

M. Sneep, D. Ityaksov, I. Aben, H. Linnartz, W. Ubachs,
Temperature dependent cross sections of O2-O2 collision-induced absorption resonances at 477 nm and 577 nm
J. of Quant. Spectr. Rad. Transfer, 98 (2006) 405-424

R.C. Shiell, E. Reinhold, F. Magnus, W. Ubachs,
Control of diabatic vs. adiabatic field dissociation in a heavy Rydberg system
Phys. Rev. Lett. 95 (2005) 213002
This paper also appeared in the Virtual Journal of Ultrafast Science

S. Witte, R.T. Zinkstok, W. Ubachs, W. Hogervorst, K.S.E. Eikema,
Deep ultraviolet quantum-interference metrology with ultrashort laser pulses
Science 307 (2005) 400-403
See also: Perspective on this paper

B.R. Lewis, S.T. Gibson, J.P. Sprengers, W. Ubachs, A. Johansson, C.-G. Wahlstrom,
Lifetime and predissociation yield of 14N2 b1Pu(v=1) revisited: effects of rotation
J. Chem. Phys. 123 (2005) 236101

E.J. Salumbides, J.P. Sprengers, E. Reinhold, W. Ubachs,
High precision frequency calibration of N I lines in the XUV domain
J. Phys. B 38 (2005) L383-L387

S. Hannemann, G.R. Wu, E.-J. van Duijn, W. Ubachs, Ph. Cosby,
Pressure broadening and fine-structure dependent predissociation in oxygen B3Su-, v=0
J. Chem. Phys. 123, 174318 (2005)

L. K. Cheng, R. Koops, A. Wielders, W. Ubachs,
Alternative fringe sensor for DARWIN mission
Proc. SPIE Int. Soc. Opt. Eng. 5905, 59051E (2005), link SPIE

L. K. Cheng, R. Koops, A. Wielders, W. Ubachs,
Development of a fringe sensor based on 3x3 fiber optic coupler for space interferometry
Proc. SPIE Int. Soc. Opt. Eng. 5855, 1004 (2005), link SPIE

J.P. Sprengers, E. Reinhold, W. Ubachs, K.G.H. Baldwin, B.R. Lewis,
Optical observation of the 3ssg F3Pu Rydberg state of N2
J. Chem. Phys. 123 (2005) 144315.

S. Hannemann, U. Hollenstein, E.-J. van Duijn, W. Ubachs,
Production of narrowband tunable XUV radiation by non-collinear resonance enhanced four-wave mixing
Opt. Lett. 30 (2005) 1494-1496

S. Hannemann, E.-J. van Duijn, W. Ubachs,
Deep-UV high resolution cavity ring-down spectroscopy of the Schumann-Runge bands in 16O2 and 18O2 at wavelengths 197 - 203 nm
J. Mol. Spectr. 232 (2005) 33-38

I. Labazan, E. Reinhold, W. Ubachs, V.V. Flambaum
Wavelength calibration of the C I line at 94.5 nm for comparison with quasar data
Phys. Rev. A 71 (2005) 040501(R)

B. Bahnev, L. van der Sneppen, A.E. Wiskerke, F. Ariese, C. Gooijer, W. Ubachs,
Miniaturized Cavity Ring-Down detection in a liquid flow cell
Anal. Chem. 77 (2005) 1188-1191

I. Velchev, W. Ubachs,
Statistical properties of the Stokes signal in stimulated Brillouin scattering pulse compressors
Phys. Rev. A 71 (2005) 043810

J.P. Sprengers, W. Ubachs, K.G.H. Baldwin
Isotopic variation of experimental lifetimes for the lowest 1Pu states in N2
J. Chem. Phys. 122 (2005) 144301

E. Reinhold, W. Ubachs,
Heavy Rydberg states
Mol. Phys. 103 (2005) 1329-1352

F. Giammanco, A. Pirri, F. Brandi, M. Barkauskas, W. Ubachs
Measurements of chirp-induced frequency shift in high-harmonic generation in xenon
Laser Physics 15 (2005) 328-333

M. Barkauskas, F. Brandi, F. Giammanco, D. Neshev, A. Pirri, W. Ubachs
A novel-type tunable and narrowband extreme ultraviolet radiation source based on high-harmonic conversion of picosecond laser pulses
J. Electr. Spectr. Rel. Phen. 144-147 (2005) 1151-1155

W. Ubachs,
High resolution molecular physics studies using a laser-based tunable XUV source at 107 resolving power
J. Electr. Spectr. Rel. Phen. 144-147 (2005) 97-101

M. Sneep, W. Ubachs,
Direct measurement of the Rayleigh J. Quant. Spectr. Rad. Transfer 92 (2005) 293-310

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