Photo-induced oxidation-enhancement in biomimetic bridged Ru(II)-Mo(VI) photo-catalyst is unexpectedly photo-activated in ps timescales. One-photon absorption generates an excited state where both photo-oxidized and photo-reduced catalytic centres are activated simultaneously and...

The ultrafast photochemical reaction of quinone methide (QM) formation from adamantylphenol was monitored in real time using femtosecond transient absorption spectroscopy and fluorescence upconversion in solution at room temperature. Experiments...

We report on the implementation of a multi-kHz single-shot referenced non-coherent two-dimensional UV spectrograph based on conventional pump-probe geometry. It has the capability to cover a broad spectral region in excitation from 270-to-380 nm and in the detection from 270-to-390 nm and 320-to-720 nm. Other setups features are: an unprecedented time resolution of 33 fs (standard deviation); signals are photometrically corrected; a single-shot noise of <1 mOD. It has the capability to operate with sample volumes as small as few μl which is an accomplishment in studying biological or biomimetic systems. To show its performances and potentials, we report two preliminary studies on the photophysics of phenanthrenes hosted in a multichromophoric antenna system and of aromatic amino acids in a blue-copper azurin.

In this paper we have investigated three wave interaction analytically for stimulated Raman back-scattering in resonance and non-resonance conditions in an under dense plasma. We have solved equations by similarity transformations and have found self similar solutions. It has been shown that by increasing time, maximum of amplified pulse increase constantly while the duration decrease inversely. Effects of initial seed pulse's amplitude and detuning parameter have been investigated.

Population densities for the excited levels of hydrogen-like ions in an optically thin plasma have been calculated in order to investigate the appropriate conditions for the generation of population inversion by recombination and subsequent development of gain in laser systems. To achieve this goal, collisional-radiative model in a range of electron temperature of 22 4000 256000 ZZ  0 K and electron density of 8 7 18 7 10 10 ZZ  3cm  is used. In addition, the inversion threshold temperature is introduced and used in characteristic graphs which helps to identify the inversion conditions.