Majed Chergui

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Related publications (250)

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

Chemical synthesis and optical properties of size-selected CdSe tetrapod-shaped nanocrystals

Majed Chergui, Awos Al Salman

2005

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

Fluorescence and phosphorescence from individual C-60 molecules excited by local electron tunneling

Majed Chergui, François Patthey, Wolf-Dieter Schneider, Elizabeta Cavar, Marina Pivetta

Using the highly localized current of electrons tunneling through a double barrier scanning tunneling microscope junction, we excite luminescence from a selected C60 mol. in the surface layer of fullerene nanocrystals grown on an ultrathin NaCl film on Au( ...

2005

Picosecond time-resolved X-ray Absorption Spectroscopy of solvated organometallic complexes

Majed Chergui, Wojciech Gawelda, Melanie Saes

We describe an experimental setup, which measures transient chemical changes of photoexcited solutes in disordered systems via time-resolved X-ray Absorption Spectroscopy (XAS) with picosecond temporal resolution. The setup combines a femtosecond amplified ...

2005

Q-factor optimization of a tuning-fork/fiber sensor for shear-force detection

Majed Chergui, Jinquan Liu, Andrea Callegari

We present the results of an exptl. and theor. study on the optimum design of shear-force sensors, used in scanning probe microscopes. We have optimized a configuration consisting of a tuning-fork/fiber-tip assembly, achieving quality factors (Q) exceeding ...

AIP American Institute of Physics2005

Synthesis of high quality zinc blende CdSe nanocrystals

Majed Chergui, Awos Al Salman

Highly homogeneous and luminescent CdSe colloidal nanocrystals in the less common zinc blende crystal structure have been obtained at high temperature in a noncoordinating organic solvent. The key parameter appears to be the addition of a phosphonic acid t ...

2005

Ultrafast solvent response upon a change of the solute size in non-polar supercritical fluids

Majed Chergui

Non-polar solvation dynamics has been investigated using steady-state absorption and emission spectroscopy of the NO A(2)Sigma(+)(3ssigma) Rydberg state in fluid Ar over a wide range of densities spanning the supercritical regime. Equilibrium molecular dyn ...

2005

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