Gas-phase femtosecond transient absorption spectroscopy

Abstract

Time resolved metal line profile by near-ultraviolet tunable diode laser absorption spectroscopyA setup for measuring femtosecond transient absorption in the gas phase is reported. The apparatus is based on a 1 kHz amplified Ti:sapphire laser system and measures gas-phase transient absorption using a shot-to-shot normalization scheme with background subtraction. We have used this setup to examine the wave packet dynamics of the I 2 B state in the vapor phase as a benchmark. The results are consistent with those reported by other groups using indirect transient absorption techniques.

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“…As aplicações da técnica de bombeio e prova vão desde o estudo de gases, com excitação e prova no ultravioleta de vácuo 27 , ou no visível 28 ;…”

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“…The ultrashort femtosecond duration of the laser pulse makes it possible to probe the elementary photophysical and photochemical processes in real time [124][125][126]. Ultrafast optical spectroscopy studies have been carried out in the gas phase [127][128][129], solutions [130][131][132], crystals [88,133,134], conjugated polymers [109,136,137], semiconductors [138][139][140][141], and biological systems [142][143][144].…”