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Majed Chergui

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Related publications (250)

Ultrafast structural dynamics with photons and electrons

Majed Chergui

Amer Chemical Soc2013

Interplay between intra- and intermolecular dynamics of metal complexes in solution

Majed Chergui

Amer Chemical Soc2013

The role of Hartree-Fock exchange in the simulation of X-ray absorption spectra: A study of photoexcited [Fe(bpy)(3)](2+)

Majed Chergui, Ursula Röthlisberger, Ivano Tavernelli, Marco Eli Reinhard, Mercedes Hannelore Rittmann-Frank, Thomas James Penfold, Gloria Capano

We present a theoretical analysis for the K- and L-2/3-edge static and picosecond X-ray absorption spectra of Fe(bpy)(3). Simulations of the pre-edge region at the Fe K-edge using time-dependent density functional theory demonstrate the importance of ...

Elsevier2013

Ultrafast inter-ionic charge transfer of transition-metal complexes mapped by femtosecond X-ray powder diffraction

Majed Chergui

The transient electronic and molecular structure arising from photoinduced charge transfer in transition metal complexes is studied by X-ray powder diffraction with a 100 fs temporal and atomic spatial resolution. Crystals containing a dense array of Fe(II ...

American Institute of Physics2013

Ultrafast Tryptophan-to-Heme Electron Transfer in Myoglobins Revealed by UV 2D Spectroscopy

Majed Chergui, Frank van Mourik, Cristina Consani, Gerald Auböck

Tryptophan is commonly used to study protein structure and dynamics, such as protein folding, as a donor in fluorescence resonant energy transfer (FRET) studies. By using ultra-broadband ultrafast two-dimensional (2D) spectroscopy in the ultraviolet (UV) a ...

American Association for the Advancement of Science2013

X-ray Absorption Spectroscopy of Ground and Excited Rhenium–Carbonyl–Diimine Complexes: Evidence for a Two-Center Electron Transfer

Majed Chergui, Ursula Röthlisberger, Ivano Tavernelli, Amal El Nahhas, Van Thai Pham, Renske Marjan van der Veen, Frederico Alves Lima, Thomas James Penfold

Steady-state and picosecond time-resolved X-ray absorption spectroscopy is used to study the ground and lowest triplet states of ReX(CO)(3)(bpy), X = Etpy (n = 1), Cl, or Br (n = 0). We demonstrate that the transient spectra at both the Re L3- and Br ...

Amer Chemical Soc2013

Transient mid-IR study of electron dynamics in TiO2 conduction band

Michel Rossi, Majed Chergui, Mercedes Hannelore Rittmann-Frank, Fabio Giacomo Santomauro

The dynamics of TiO2 conduction band electrons were followed with a novel broadband synchrotron-based transient mid-IR spectroscopy setup. The lifetime of conduction band electrons was found to be dependent on the injection method used. Direct band gap exc ...

Royal Society of Chemistry2013

Solvent rearrangements during the transition from hydrophilic to hydrophobic solvation

Majed Chergui, Ursula Röthlisberger, Ivano Tavernelli, Manuel Dömer, Thomas James Penfold

We present an ab initio Born-Oppenheimer molecular dynamics study of the early time solvent dynamics after electron abstraction from aqueous iodide. An initial response occurs within ∼75 fs, corresponding to a water molecule sharing almost one electron wit ...

Elsevier2013

Solvent Induced Luminescence Quenching: Static and Time-Resolved X-Ray Absorption Spectroscopy of a Copper(I) Phenanthroline Complex

Majed Chergui, Olivier Christian Bräm, Ursula Röthlisberger, Ivano Tavernelli, Frederico Alves Lima, Marco Eli Reinhard, Mercedes Hannelore Rittmann-Frank, Thomas James Penfold, Lotta Susanne Karlsson, Jochen Rittmann, Gloria Capano

We present a static and picosecond X-ray absorption study at the Cu K-edge of bis(2,9-dimethyl-1,10-phenanthroline)copper(I) (Cu(dmp)(2); dmp = 2,9-dimethyl-1,10-phenanthroline) dissolved in acetonitrile and dichloromethane. The steady-state photolumi ...

Amer Chemical Soc2013

Nanoscale dynamics by short-wavelength four wave mixing experiments

Majed Chergui

Multi-dimensional spectroscopies with vacuum ultraviolet (VUV)/x-ray free-electron laser (FEL) sources would open up unique capabilities for dynamic studies of matter at the femtosecond-nanometer time-length scales. Using sequences of ultrafast VUV/x-ray p ...

Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2013

Real-time observation of the charge transfer to solvent dynamics

Majed Chergui, Olivier Christian Bräm, Andrea Cannizzo

Intermolecular electron-transfer reactions have a crucial role in biology, solution chemistry and electrochemistry. The first step of such reactions is the expulsion of the electron to the solvent, whose mechanism is determined by the structure and dynamic ...

Nature Publishing Group2013

Temperature-dependent electron-phonon coupling in La_{2−x}Sr_{x}CuO_{4} probed by femtosecond x-ray diffraction

Majed Chergui, Paul Beaud, Mathieu Julien Gino Cottet, Krunoslav Prsa, Henrik Moodysson Rønnow, Fabrizio Carbone, Kazimierz Conder, Giulia Fulvia Mancini

The strength of the electron-phonon coupling parameter and its evolution throughout a solid's phase diagram often determines phenomena such as superconductivity, charge- and spin-density waves. Its experimental determination relies on the ability to distin ...

Amer Physical Soc2013

Investigating pairing interactions with coherent charge fluctuation spectroscopy

Majed Chergui, Ahmad Odeh, Fabrizio Carbone, Andreas Helmut Christian Mann

It has been recently demonstrated that a pump pulse can generate coherent charge fluctuations in a superconductor through a stimulated Raman process [Mansart, et al., Proc. Natl. Acad. Sci. USA 110, 4539 (2013)]. Here, we present a tutorial review of the b ...

Springer Verlag2013

A wavelet analysis for the X-ray absorption spectra of molecules

Majed Chergui, Ursula Röthlisberger, Ivano Tavernelli, Amal El Nahhas, Marco Eli Reinhard, Thomas James Penfold

We present a Wavelet transform analysis for the X-ray absorption spectra of molecules. In contrast to the traditionally used Fourier transform approach, this analysis yields a 2D correlation plot in both R- and k-space. As a consequence, it is possible to ...

American Institute of Physics2013

Hydrophobicity with atomic resolution: Steady-state and ultrafast X-ray absorption and molecular dynamics studies

Majed Chergui, Ivano Tavernelli, Thomas James Penfold

Static and time-resolved X-ray absorption spectroscopy (XAS) is used to probe the solvent shell structure around iodide and iodine. In particular, we characterize the changes ob served upon electron abstraction of aqueous iodide, which reflects the transit ...

De Gruyter2013

Ultraviolet transient absorption, transient grating and photon echo studies of aqueous tryptophan

Majed Chergui, Olivier Christian Bräm, Andrea Cannizzo, Ahmad Ajdar Zadeh Oskouei, Cristina Consani

We compare UV transient grating (TG) experiments of aqueous tryptophan with transient absorption (TA) and fluorescence up-conversion measurements. The TG and TA signals show a bi-exponential rise with sub-ps and ps time constants, which are consistent with ...

Elsevier2013

Polychromatic femtosecond fluorescence studies of metal-polypyridine complexes in solution

Majed Chergui, Olivier Christian Bräm, Andrea Cannizzo, Ahmed Maher Fahmy El-Zohry

Femtosecond-resolved broadband fluorescence studies are reported for M(bpy)(3) (M = Fe, Ru), RuN3 and RuN719 complexes in solution. We investigated the pump wavelength dependence of the fluorescence of aqueous Fe(bpy)(3) and the solvent and li ...

2012

Ultrafast anisotropic x-ray scattering in the condensed phase

Majed Chergui, Ursula Röthlisberger, Ivano Tavernelli, Thomas James Penfold

The advent of x-ray free electron lasers offers new opportunities for x-ray scattering (XRS) studies of ultrafast molecular dynamics in liquids, which have so far been limited to the 100 ps resolution of synchrotrons. In particular, anisotropic XRS induced ...

Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2012

Energy transfer and relaxation mechanisms in Cytochrome c

Majed Chergui, Olivier Christian Bräm, Frank van Mourik, Andrea Cannizzo, Cristina Consani

Using broadband UV-vis femtosecond transient absorption and fluorescence up-conversion, we investigate the interaction between the haem moiety of ferric and ferrous Horse heart Cytochrome c and its single Tryptophan (Trp) residue and the energy dissipation ...

Elsevier2012

Reply to 'Dark channel fluorescence ... ' and 'Dips and peaks ... '

Majed Chergui

Nature Publishing Group2012

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