Light Emission after Pulse Radiolysis of Aqueous Solutions of Dyes

New sonochemiluminescence involving solvated electron in Ce(III)/Ce(IV) solutions

“…A similar general dependence was previously observed in the studies of radioluminescence in aqueous solutions of some dyes and aminobenzoic acids [28] , [29] . These studies noted that at low luminophore concentrations, the luminescence intensity is defined by radiochemiluminescence 2 whereas linear dependence at high concentrations is due to the luminophore excitation under the direct action of ionizing irradiation, i.e., collisions with charged particles (electrons, α-particles, etc.).…”

Hot electron-induced electrochemiluminescence of fluorescein in aqueous solution

“…(14) cannot be the source of emission. Pruetz et al [28] assumed both the excitation steps (12) and (13) possible at first, but later Pruetz and Land [29] turned to the opinion that ox-red pathway composed by reaction (11) and (13) was the actual RCL pathway. This was supported by Rodde and Grossweiner [50], who mainly studied a somewhat different system in which they first produced optically excited dyes by a flash of light before giving the electron pulse.…”

“…Pruetz et al [28] have studied radiochemiluminescence of fluorescein almost 40 years ago by pulse radiolysis using 2 ls pulses of 4 MeV electrons. They found out that semireduced fluorescein (Flu 3ÅÀ ) and semioxized fluorescein (Flu ÅÀ ) absorptions had lifetimes of the order of milliseconds, but the RCL pulse was much faster decaying (in time frame of tens of microseconds).…”

“…This was most interesting, because fluorescein is one of the very rare luminescent label molecules known to show radiochemiluminescence induced by hydrated electrons and hydroxyl radicals [28,29]. These are exactly the same species that we have postulated to be the primary reactive species generated at our tunnel emission electrodes inducing chemiluminescence from various luminophores [19,[21][22][23].…”

On the Mechanisms of X‐Ray‐Induced Excitation of Aromatic Molecules in Polar Solution

“…Thus, evidence has been found that in aqueous solutions solute molecules can be excited by reactions with eaq and OH radicals. formed in the solvent [9,10).…”