Person

Majed Chergui

Related publications (351)

Dynamics of the Penning Ionization of Fullerene Molecules by Metastable Neon Atoms

The collisional energy dependence of the cross section for the Penning ionization of C60 mols. by metastable neon atoms was measured in the 0.035-0.5 eV range in a crossed beam expt. The results show a decreasing trend (.apprx.20%) in the low-energy range ...

2000

Femtochemistry

Majed Chergui

A review with 51 refs. of the developments leading to the advent of femtochem. is presented, along with the major achievements that have marked the past fifteen years since the birth of the field. [on SciFinder (R)] ...

2000

Medium effects on the spectroscopy and intramolecular energy redistribution of C60 in cryogenic matrices

Majed Chergui

A review with 30 refs. on some of the authors works on the absorption, excitation and emission spectra of C60 embedded in rare gas matrixes while stressing the role of the environment. The gas phase resonant 2-photon ionization spectrum of C60 is reanalyze ...

2000

Photoinduced dynamics in solid hydrogens

Majed Chergui, Franco Vigliotti

The medium response of solid hydrogens to an impulsive perturbation has been studied using Rydberg excitation of an NO impurity. This leads to formation of an "electronic" bubble which corresponds to a cage radius increment of about 25%. The process has ...

2000

Spectroscopy and energy relaxation processes of Hg-doped solid neon, argon, and xenon

Majed Chergui

Emission, absorption, and excitation spectroscopy was used for a detailed anal. of the optical transitions of Hg2 trapped in cryogenic matrixes. Upon excitation of electronic states correlating to the 3P1 or the 1P1 asymptote, fast nonradiative relaxation ...

2000

Ultrafast energy redistribution in fullerenes

Majed Chergui, Franco Vigliotti, Marcia Portella Oberli

The energy redistribution processes in C60 trapped in low temp. rare gas solids have been studied using one- and two-color femtosecond pump-probe spectroscopy. The data show an ultrafast internal conversion process, followed by a slower electronic relaxati ...

2000

Investigation of nanolocal fluorescence resonance energy transfer for scanning probe microscopy

Majed Chergui, Giovanni Dietler

Fluorescence resonance energy transfer (FRET) was obsd. between donor dye mols. deposited onto the sample surface and acceptor dye mols. deposited onto the scanning near-field optical microscope (SNOM) or at. force microscope tip. FRET was obsd. only when ...

1999

Dynamics of electronic "bubble" formation in solid hydrogen

Majed Chergui, Franco Vigliotti, Marcia Portella Oberli

Excitation of the A(3ss) Rydberg state of NO trapped in an H2 crystal leads to the electronic bubble formation around the NO impurity, resulting in an increase of 0.9 .ANG. of the ground state cage radius. Its dynamics was followed in real-time by femtosec ...

1999

Observation of coherent cage motion in electronically excited doped argon and hydrogen crystals

Majed Chergui, Marcia Portella Oberli

We report on the ultrafast dynamics of electronic bubble formation following excitation of the A 3ss Rydberg state of the NO mol. trapped in argon and hydrogen matrixes. The study is carried out by femtosecond fluorescence depletion expts. Apparently in hy ...

1999

Dynamics of Electronic "Bubble" Formation in Solid Hydrogen: A Classical Model Calculation based on Fluid Dynamics

Majed Chergui, Franco Vigliotti

A model based on fluid dynamics is proposed, which describes the dynamics of a photoinduced spherical deformation in solid hydrogen. The dynamics is driven by femtosecond excitation of the lowest A(3ss) Rydberg state of NO trapped in an H2 crystal, leading ...

1999

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