Spectral Signatures of Ultrafast ESIPT

In the following we discuss the spectral signatures observed by ultrafast absorption spectroscopy of ESIPT molecules with a time resolution sufScient to temporally resolve the nuclear motions during the transfer. Pioneering work was performed on 2-(2 -hydroxy-5 -methylphenyl)benzotriazole (TINUVIN P), and for the first time oscillatory signal contributions associated with the ESIPT were observed [26]. 

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This chapter focuses on the ultrafast ESIPT found in molecules containing an H-chelate ring (figure 4.1). We will introduce the most popular experimental techniques and discuss what kind of information can be extracted from the spectral signatures associated with the ESIPT and subsequent processes. In the remainder of the introduction, we introduce the investigated molecular systems. The subsequent experimental section describes different pump-probe techniques. Then the transient spectroscopic signatures and their interpretation and evaluation... 

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