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Frank van Mourik

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Publications associées (54)

Femtosecond fluorescence upconversion setup with broadband detection in the ultraviolet

Majed Chergui, Olivier Christian Bräm, Frank van Mourik, Goran Zgrablic, Andrea Cannizzo, Ahmad Ajdar Zadeh Oskouei

We show a femtosecond fluorescence upconversion setup with broadband detection to measure time-resolved emission spectra in the 300-550 nm range, upon excitation between 250 and 300 nm, with a time resolution of 100 fs. We present time-resolved fluorescenc ...

2007

Liquid dynamics in ZrO2 nanoporous films

Majed Chergui, Frank van Mourik, Erwin Portuondo Campa

Time-resolved Optical Kerr Effect (OKE) measurements were used to det. the orientational dynamics of water and acetonitrile in the bulk and in pores of ZrO2 nanostructured films. The expts. were performed with a home-built OKE microscope, capable of provid ...

2007

Femtosecond polarization relaxation in CdSe nanocrystals

Majed Chergui, Frank van Mourik, Awos Al Salman

We present ultrafast pump-probe studies on chem. prepd. CdSe nanocrystals. Upon pulsed optical excitation we find pronounced oscillations, indicating strong coupling to a LO phonon mode. From the polarization dependence of the signal addnl. information abo ...

2007

Ultrafast Nonadiabatic Dynamics of [FeII(bpy)3]2+ in Solution

Majed Chergui, Frank van Mourik, Wojciech Gawelda, Andrea Cannizzo, Van Thai Pham

The ultrafast relaxation of aq. Fe(II)-tris(bipyridine) upon excitation into the singlet metal-to-ligand charge-transfer band (1MLCT) was characterized by femtosecond fluorescence up-conversion and transient absorption (TA) studies. The fluorescence expt. ...

2007

Modelling of aqueous solvation of eosin Y at the rutile TiO2(110)/water interface

Majed Chergui, Frank van Mourik, Erwin Portuondo Campa

Mol. dynamics simulations at 298 K are used to study an aq. dissolved dye (eosin Y) adsorbed at the TiO2(1 1 0) surface to ext. static and dynamic information of solvation. Differences in the phys. behavior of the dye at the surface and in bulk H2O are com ...

Elsevier2006

Time-Resolved Photodynamics of Triangular-Shaped Silver Nanoplates

Majed Chergui, Frank van Mourik, Luigi Bonacina, Camilla Bonati, Andrea Callegari

The authors measured the ultrafast response of triangular silver nanoparticles upon femtosecond excitation of their plasmon resonance. After a fast electron relaxation, the signature of a bimodal mech. vibration of the particle is apparent as a spectral mo ...

2006

Aqueous Solvation Dynamics at Metal Oxide Surfaces

Jacques-Edouard Moser, Majed Chergui, Frank van Mourik, Erwin Portuondo Campa

Broadband transient absorption (TA) spectroscopy, three-pulse photon echo peak shift (3PEPS), and anisotropy decay measurements were used to study the solvation dynamics in bulk water and interfacial water at ZrO2 surfaces, using Eosin Y as a probe. The 3P ...

2006

The ultrafast structural response of solid parahydrogen: a complementary experimental/simulation investigation

Majed Chergui, Frank van Mourik, Luigi Bonacina

A complete characterization, based on fs pump-probe spectroscopy and mol. dynamics simulations, is presented of the ultrafast dynamics of electronic bubble formation in solid para-H2 upon impulsive excitation of impurity-doped sites, which correlate with t ...

2006

Insights into excited-state and isomerization dynamics of bacteriorhodopsin from ultrafast transient UV absorption

Majed Chergui, Selma Schenkl, Frank van Mourik

A visible-pump/UV-probe transient absorption is used to characterize the ultrafast dynamics of bacteriorhodopsin with 80-fs time resoln. We identify three spectral components in the 265- to 310-nm region, related to the all-trans retinal, tryptophan (Trp)- ...

National Academy of Sciences2006

Broadband femtosecond fluorescence spectroscopy of [Ru(bpy)3]2+

Majed Chergui, Frank van Mourik, Wojciech Gawelda, Goran Zgrablic, Andrea Cannizzo

Femtosecond fluorescence-upconversion studies of aq. [Ru(bpy)3]2+ show a short-lived vibrationally hot emission of the singlet metal-to-ligand charge-transfer state, with an ultrafast intersystem crossing (~ 10 fs) to the triplet state at const. energy (th ...

Wiley-VCH Verlag GmbH2006

Raman-induced signals in optical Kerr effect measurements of water with elliptically polarized pulses

Majed Chergui, Frank van Mourik, Erwin Portuondo Campa

In 2-color optical Kerr effect measurements of water, addnl. signals can occur in the pulse overlap region if the energy difference between pump and probe pulses approaches the Raman resonance of the OH-stretch vibration. These features can be understood b ...

2006

High-voltage pulse generator for THz field generation

Majed Chergui, Frank van Mourik

We describe a simple and low cost design for generating high voltage pulses using commercially available Ruhmkorff's coils. Our application is the biasing of large area photoconductive switches, used for THz generation, operating at kHz repetition rates. T ...

2005

Spectral and dynamical characterization of multiexcitons in colloidal CdSe semiconductor quantum dots

Majed Chergui, Frank van Mourik, Camilla Bonati, Goran Zgrablic

Femtosecond photoluminescence (PL) up-conversion studies in polychromatic mode and laser-power-dependence studies of the PL were carried out on colloidal solutions of CdSe quantum dots with diameters ranging from 2.4 to 4 nm. The main features of the spect ...

2005

Probing the ultrafast charge translocation of photoexcited retinal in bacteriorhodopsin

Majed Chergui, Selma Schenkl, Frank van Mourik

The ultrafast evolution of the electric field within bacteriorhodopsin was measured by monitoring the absorption changes of a tryptophan residue after excitation of retinal. The Trp absorption decreases within the first 200 femtoseconds and then recovers o ...

American Association for the Advancement of Science2005

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