Higher Excited States in Multiphoton Photochemical Reactions “Hint” Toward Rapid Chemistry

Two-Photon Excitation of trans-Stilbene: Spectroscopy and Dynamics of Electronically Excited States above S1

“…Probing the ultrafast dynamics of molecules in electronically excited states above S 1 represents an important frontier in the field of chemical reaction dynamics that challenges the current limits of both experiment and theory. 1 Among other complications, the rapidly increasing density of electronic states leads to strong configurational mixing and very short excited-state lifetimes for even the smallest of molecules, as manifest in Kasha's rule. 2 Nevertheless, probing the behavior of these highly excited systems is important for developing a predictive and general understanding of the non-adiabatic dynamics that govern chemical reactions under a wide range of conditions.…”

“…Probing the ultrafast dynamics of molecules in electronically excited states above S 1 represents an important frontier in the field of chemical reaction dynamics that challenges the current limits of both experiment and theory . Among other complications, the rapidly increasing density of electronic states leads to strong configurational mixing and very short excited-state lifetimes for even the smallest of molecules, as manifest in Kasha’s rule .…”

2'-Methoxyacethopenone as DNA Photosensitiser for Mono and Biphotonic Processes

“…2 This behaviour has been reported for anthracene and its derivatives, anthraquinones or benzyl. [105][106][107][108][109][110][111][112] This type of chemistry was developed with the employment of lasers to address mechanistic studies; using pulsed light or conventional lamps can give rise to very different results due to the high concentration of transient species that a laser source can generate. These species can compete for the absorption of photons with their precursors in the groud state, thus they can give rise to multiphotonic chemical processes different from those observed by direct conventional excitation.…”

“…These species can compete for the absorption of photons with their precursors in the groud state, thus they can give rise to multiphotonic chemical processes different from those observed by direct conventional excitation. 2,109,111 Figure 1.11 Deactivation of upper excited states through radiative and nonradiative processes.…”