Abstract
The photodecomposition of several aliphatic amino acids, glycine, valine (Val), leucine and methionine and a dipeptide (Val-Val), was studied in neutral aqueous solution using 248 nm 20 ns laser pulses which are focused to the intensity of 4 × 10 12 W m −2. Under these conditions water absorbs by a two-photon mechanism, yielding water radicals which attack the solute molecules. A similarity of the action of water radicals produced either by two-photon water photolysis or by γ-radiolysis was found in Ar- and N 2O-saturated solution and under Ar in the presence of tert-butanol (0.1 M). The efficiencies of photodecomposition (quantum yield and G value) were determined and compared with the G value of decomposition under γ-radiolysis. With high-intensity 308 nm 20 ns laser pulses it was shown that the photodecomposition of leucine occurs via a two-photon absorption mechanism, but with significantly smaller efficiency.
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