Publications de Goran Zgrablic

Mechanism of ultrafast non-reactive deactivation of the retinal chromophore in non-polar solvents

The photoisomerization of the all-trans protonated Schiff base of retinal (SBR+) in solution is highly inefficient. The present theoretical and experimental investigation aims at disclosing the mechanisms of ultrafast, non-reactive relaxation of SBR+ that ...

Royal Soc Chemistry2017

Heterogeneity and relaxation dynamics of the photoexcited retianl Schiff base cation in solution

Stefan Haacke, Majed Chergui, Goran Zgrablic

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

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

Vibrational coherences of the protonated Schiff base of all-trans-retinal in solution

Stefan Haacke, Majed Chergui, Goran Zgrablic

Modulations in the time gated ultrafast fluorescence of the protonated Schiff base of retinal in various solvents are reported, which reflect the creation and evolution of vibrational wave packets due to the torsional mode of retinal of frequency .apprx.12 ...

2007

On the excitation wavelength dependence of the fluorescence of bacteriorhodopsin

Stefan Haacke, Majed Chergui, Selma Schenkl, Erwin Portuondo Campa, Goran Zgrablic

We present a systematic study of the time-integrated fluorescence of native bacteriorhodopsin, as a function of excitation wavelength across the visible absorption band. While the fluorescence max. is unaffected, the spectrum broadens on the high-energy si ...

Elsevier2007

Solvent effects on the ultrafast dynamics of the retinal chromophore of bacteriorhodopsin

Goran Zgrablic

Photo-induced excited-state reactions stand in the center of function of the photosensitive biological systems. These reactions can be accompanied by structural changes of the chromophore (for example isomerization) which are influenced by the nearest envi ...

EPFL2006

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

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

Ultrafast Excited State Dynamics of the Protonated Schiff Base of All-trans Retinal in Solvents

Goran Zgrablic

We present a comparative study of the ultrafast photophysics of all-trans retinal in the protonated Schiff base form in solvents with different polarities and viscosities. Steady-state spectra of retinal in the protonated Schiff base form show large absorp ...

2005