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On the excitation wavelength dependence of the fluorescence of bacteriorhodopsin

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Coherent ultrafast torsional motion and isomerization of a biomimetic dipolar photoswitch

Majed Chergui, Andrea Cannizzo, Olivier Christian Bräm, Stefan Haacke

Femtosecond fluorescence up-conversion, UV-Vis and IR transient absorption spectroscopy are used to study the photo-isomerization dynamics of a new type of zwitterionic photoswitch based on a N-alkylated indanylidene pyrroline Schiff base framework (ZW-NAI ...

Royal Society of Chemistry2010

Near-field mediated enhancement of two-photon induced fluorescence on plasmonic nanostructures

Noelia Laura Bocchio

We investigate two-photon-induced fluorescence for organic chromophores next to elongated gold disks which support plasmonic resonances. By polyelectrolyte coating, the dye is placed in a defined concentration at a defined distance from the surface. A fluo ...

American Chemical Society2010

A series of cationic metalla-rectangles of the general formula [(p-cymene)4Os4(OO.intrsec.OO)2(N.intrsec.N)2]4+ have been obtained in methanol from the dinuclear arene osmium precursors [(p-cymene)2Os2(OO.intrsec.OO)2Cl2] (OO.intrsec.OO = 2,5-dihydroxy-1,4 ...

Royal Society of Chemistry2010

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Multiphoton excited luminescent properties of water-soluble EuIII and TbIII complexes with derivatives of dipicolinic acid functionalized with a polyoxyethylene pendant arm and terminal groups, [Eu(LOMe)3]3−, [Eu(LNH2)3]3−, and [Tb(LOH)3]3−, as well as of ...

2010

Multiphoton-Excited Luminescent Lanthanide Bioprobes: Two- and Three-Photon Cross Sections of Dipicolinate Derivatives and Binuclear Helicates

Majed Chergui, Jean-Claude Bünzli, Anne-Sophie Chauvin, Frank van Mourik, Andrea Cannizzo, Svetlana Eliseeva, Bo Song, Gerald Auböck

Multiphoton excited luminescent properties of water-soluble EuIII and TbIII complexes with derivatives of dipicolinic acid functionalized with a polyoxyethylene pendant arm and terminal groups, [Eu(LOMe)3]3-, [Eu(LNH2)3]3-, and [Tb(LOH)3]3-, as well as of ...

2010

Propriétés optiques de petits agrégats de métaux nobles en matrice de néon

Sylvain Lecoultre

The optical properties of small noble metal clusters have been studied by absorption and fluorescence for sizes between 1 and 10 atoms. The experimental technique consists in depositing size-selected clusters in a neon matrix and analyzing with a spectrome ...

EPFL2009

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We report for the first time the absorption and fluorescence spectra of gold dimers in a neon matrix. The dimer absorption spectra show the A←X transition predicted from measurements in the gas phase and not observed so far in a matrix, as well as the so-c ...

2009

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We present steady-state and broadband femtosecond fluorescence spectra of the protonated Schiff base of retinal in various protic and aprotic solvents, as a function of the excitation wavelength. A detailed spectral decomposition of the time-resolved fluor ...

2009

Conformational flexibility of a rotaxane thread probed by electronic spectroscopy in helium nanodroplets

Marcel Drabbels

Ultra-high-resolution spectroscopic studies have been performed to elucidate the conformational landscape of the succinamide-based thread 1 that is frequently employed in mechanically interlocked molecular assemblies. We show how dissolving single molecule ...

American Chemical Society2009

Observation of Long-Lived Polariton States in Semiconductor Microcavities across the Parametric Threshold

The excitation spectrum around the pump-only stationary state of a polariton optical parametric oscillator in semiconductor microcavities is investigated by time-resolved photoluminescence. The response to a weak pulsed perturbation in the vicinity of the ...

2009