Transient absorption spectroscopy is a powerful technique used in the field of photochemistry and photophysics to study the dynamics of photoinduced processes in a material. It involves shining a pump laser pulse onto a sample to excite it to a higher energy state, followed by a probe laser pulse to monitor the absorption of this excited state over time. By analyzing the changes in absorption spectra as a function of time, researchers can gain insights into the kinetics and mechanisms of various photoinduced processes, such as energy transfer, charge transfer, and photochemical reactions. Transient absorption spectroscopy has applications in a wide range of fields, including materials science, biology, and environmental science.