Ultrafast Transient Absorption Spectroscopy
Broadband ultrafast transient absorption (TA) setup for the investigation of the dynamics of photoexcited samples. TA spectroscopy is a powerful pump-probe method for the study of the excited and ground states of materials ranging from organic molecules to inorganic compounds and semiconductors. This method provides vast information about internal photophysical processes, such as charge transfer, excited state absorption, hot-carrier relaxation or stimulated emission, in the material immediately after photoexcitation.
• Time resolution: 90 fs
• Maximum time window: 1 ns
• Probe range: 450-750 nm (broadband)
• Excitation wavelength range: 400 - 800 nm
(Left) Main photophysical processes that can be probed using transient absorption spectroscopy. GB: Ground-state bleach, SE: Stimulated emission, IA: Induced absorption. (Right) Typical transient absorption spectrum for a given time. Blue, green and orange signals correspond to the contributions from GB, SE and IA processes, respectively.
Transient absorption measurement of (left) a Perylene compound embedded in PMMA film and (right) TiO2 - Silver core-shell nanostructures in solution.