An ultrafast process for the fabrication of a Li metal–inorganic solid electrolyte interface

A strategy to use a reactive process using ultrasonication has been suggested for the ultrafast fabrication of Li metal–inorganic solid electrolyte interface.

Unveiling the origin of photo-induced enhancement of oxidation catalysis at Mo(vi) centres of Ru(ii)–Mo(vi) dyads

Photoinduced oxidation-enhancement in Ru(ii)–Mo(vi) photocatalysts is caused by an ultrafast process where both the moieties are photoactivated.

Ab initio insights into the mechanism of excited-state intramolecular proton transfer triggered by the second excited singlet state of a fluorescent dye: an anti-Kasha behavior

An excited-state intramolecular proton transfer (ESIPT) reaction triggered by the second excited singlet S2 state is found by ab initio calculations to be an ultrafast process for a novel fluorophore.

Charge relaxation and recombination in photo-excited Mott insulators

Recent femtosecond pump-probe experiments on Mott insulators reveal charge recombination, which is in picosecond range, i.e., much faster than in clean bandgap semiconductors although excitation gaps in Mott insulators are even larger. The charge response in photo-excited insulators can be generally divided in femtosecond transient relaxation of charge excitations, which are holons and doublons, and a second slower, but still very fast, holon–doublon (HD) recombination. We present a theory of the recombination rate of the excited HD pairs, based on the two-dimensional (2D) model relevant for cuprates, which shows that such fast processes can be explained even quantitatively with the multi-magnon emission. We show that the condition for the exponential decay as observed in the experiment is the existence of the exciton, i.e., the bound HD pair. Its recombination rate is exponentially dependent on the charge gap and on the magnon energy, while the ultrafast process can be traced back to strong charge-spin coupling. We comment also fast recombination times in the one-dimensional (1D) Mott insulators, as e.g., organic salts. The recombination rate in the latter cases can be explained with the stronger coupling with phonon excitations.

The substituent effect on the MLCT excited state dynamics of Cu(i) complexes studied by femtosecond time-resolved absorption and observation of coherent nuclear wavepacket motion

Ultrafast absorption spectroscopy clarified excited-state dynamics of bis-diimine copper(i) complexes, highlighting the substituent effect on the ultrafast process of the 1MLCT state.