Femtosecond real‐time probing of reactions. IX. Hydrogen‐atom transfer

Femtosecond real-time probing of reactions. IX. Hydrogen-atom transfer

The real-time dynamics of hydrogen-atom-transfer processes under collisionless conditions are studied using femtosecond depletion techniques. The experiments focus on the methyl salicylate system, which exhibits ultrafast hydrogen motion between two oxygen atoms due to molecular tautomerization, loosely referred to as intramolecular “proton” transfer. To test for tunneling and mass effects on t...

Femtosecond real‐time probing of reactions. XXI. Direct observation of transition‐state dynamics and structure in charge‐transfer reactions

Femtosecond probing of bimolecular reactions: The collision complex

Progress has been made in probing the femtosecond dynamics of transition states of chemical reactions.* The “half-collision” case of unimolecular reactions has been experimentally investigated for a number of systems and much theoretical work has already been developed.2 For bimolecular reactions, the case of full collision, the zero of time is a problem which makes the femtosecond temporal res...

Femtosecond up-conversion technique for probing charge transfer

We report on an experimental study of the charge transfer dynamics in a P3HT : PCBM blend by means of a femtosecond fluorescence up-conversion technique. Using two-photon excitation we probe the exciton dynamics in P3HT and a P3HT : PCBM blend with a weight ratio of 1 : 1 at excitation densities of up to 6 × 1018 cm−3. In both samples we find strongly nonexponential decay traces compatible with...

Femtosecond real‐time probing of reactions. II. The dissociation reaction of ICN