Femtosecond Time-Resolved Fluorescence Depletion Spectroscopy

Femtosecond Time-Resolved Fluorescence Depletion Spectroscopy [Pg.321]

The mechanism of FS TR SEP ED method is as follo vs (i) a first ultrashort laser pulse is used to excite a molecule to the electronically excited states leading to a fluorescent emission with a lifetime of a few nanoseconds and (ii) vith a specific delay time, a second ultrashort laser is introduced to SEP from upper state to electronic ground state. The intensity of initial fluorescence then should be reduced. [Pg.321]

The variation of the decrease of fluorescence intensity vith the delay time bet veen the tv o laser beams reflects the vibrational relaxation behavior of the electronic vibration state. [Pg.321]

Two femtosecond laser pulses were used in the experiment of FS TR SEP ED. One pulse was used as a pump source to excite the molecule to the electronically excited state, to generate fluorescence. The other, with a specific delay time, was used to perform SEP from the electronic excited states to the ground state. The variation of the decrease in the fluorescence induced by the SEP with delay time reflects vibrational relaxation in the excited states. A homemade regenerative amplified self-mode-locking Ti sapphire femtosecond laser, whose oscillator and amplifier [Pg.321]

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