The photolysis of aqueous systems at 1849 Å II. Solutions containing Cl-, Br-, SO2-4 or OH- ions

Quantum yields of nitrogen and hydrogen are recorded for the photolysis at 1849 Å of aqueous solutions of NaCl, KBr, Na2SO4, NaOH or HCl containing N2O or CH3OH or both. It is concluded: (i) That the extinction coefficients and quantum yields of hydrated electron formation are—Cl- 3800± 300m-1 cm-1 and 0.43±0.02; Br-, 13000 ± 1000 M-1 cm-1 and 0.34± 0.02; SO4-2, 260 ± 30m-1 cm-1 and 0.71 ±0.04 and OH-, 3600±600 M-1 cm-1 and 0.11. (ii) That k(e-aq +H+) = (1.49 ± 0.16) x k(e-sq. +N2O). (iii) That in alkaline solutions a chain oxidation of methanol by N2O can occur, (iv) That the application of the Noyes (1955) equation leads to unacceptably large values of the root mean square diffusive displacement.