Topic
Excimer
About: Excimer is a research topic. Over the lifetime, 3725 publications have been published within this topic receiving 75104 citations.
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01 Jan 1979
23 citations
23 citations
23 citations
TL;DR: A femtosecond pump-probe mass and photoelectron spectra for adenine (A) and microhydrated A(m)(H(2)O)(n) clusters are presented and a nanosecond lifetime from excimer states in pi-stacked clusters is observed.
Abstract: We present femtosecond pump–probe mass and photoelectron spectra for adenine (A) and microhydrated Am(H2O)n clusters. Three distinct relaxation processes of photoexcited electronic states were distinguished: in unhydrated A, relaxation of the optically bright ππ* state occurred via the dark nπ* state with respective lifetimes of <0.1 and 1.3 ps. In microhydrated clusters A(H2O)n, relaxation via the nπ* state is quenched by a faster relaxation process, probably involving πσ* states. For the predominantly hydrogen-bonded adenine dimer (A2), excited state relaxation is dominated by monomer-like processes. When the adenine dimer is clustered with several water molecules, we observe a nanosecond lifetime from excimer states in π-stacked clusters. From the electron spectra we estimate adiabatic ionization potentials of 8.32 eV (A), 8.27 eV (A(H2O)1), 8.19 eV (A(H2O)2), 8.10 eV (A(H2O)3), 8.18 eV (A2), and 8.0 eV (A2(H2O)3–5).
23 citations
TL;DR: In this paper, the conditions necessary for the existence of an isosbestic point in the fluorescence spectra of a compound which emits from the monomer as well as the excimer state were discussed.
23 citations