Abstract
Observations of time-resolved fluorescence detected magnetic resonance (FDMR) from the fluorescent recombination of geminate radical ion pairs produced by laser photoionization of scintillators in alcohols and ethers are described. The FDMR spectrum of the geminate radical ion pair produced from N,N,N{prime},N{prime}-tetramethyl-p-phenylenediamine (TMPD) in 2-propanol was resolved and assigned to the TMPD radical cation and the solvated electron. An FDMR signal was observed in hydrocarbons with small amounts of added alcohol, but not in neat hydrocarbons. In all cases, the FDMR signal observed was a resonant decrease in fluorescence intensity, indicating that photoionization occurs predominantly from singlet excited states. It is concluded that stabilization of he geminate ion pair by electron solvation is a key requirement for the observation of FDMR from the recombination of geminate ion pairs produced by photoionization.
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