Radiation chemistry of solid thiosulfate: optical absorption spectra

• Autorzy: Zagórski Z. , Rafalski A.
• Konferencja: Reactive Intermediates in Sulfur Chemistry Workshop dedicated to Professor Klaus-Dieter Asmus on His 60th birthday August 23-26, 1998, Poznan, Poland
• Języki publikacji: EN

Abstrakty

EN

Solid sodium thiosulfate, anhydrous and hydrated (5 H2O), was irradiated with 10 MeV electrons in a pulsed, high-dose (30 kGy) rate regime. The resulting optical absorption was measured by diffuse reflection spectophotometry (DRS) (absorption band in anhydrous salt at 360 nm, in hydrated salt at 418 nm). Absorption decays occurred at t1/2 = 80 h (anhydrous) and t1/2 = 9 h (hydrated) at room temperature. The yellowish radical ion formed in irradiated anhydrous thiosulfate was identified as [źS2O3]-, and not [źS2O3]3-, as proposed in previous nonoptical (EPR) investigations. The absorption spectrum of [źS2O3]- in a solid matrix was similar to the transient spectrum ascribed to the same radical, obtained by pulse radiolysis in aqueous solution, and had a lifetime many orders of magnitude shorter. A similar radical anion, but in the complex with adjacent water molecules from the hydration moiety, was observed in hydrated thiosulfate (Na2S2O3ź5 H2O).

Słowa kluczowe

EN

diffuse reflection spectrophotometry (DRS); pulse radiolysis; radiation chemistry; radical anions; sodium thiosulfate; solid-state chemistry

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2000
• Tom: Vol. 45, nr 1
• Strony: 109--113
• Opis fizyczny: . Bibliogr. 11 poz., rys.

Twórcy

autor

Zagórski Z.

autor

Rafalski A.

• Department of Radiation Chemistry, Institute of Nuclear Chemistry and Technology, 16 Dorodna Str., 03-195 Warsaw, Poland