The photolysis of aqueous systems at 1849 Å II. Solutions containing Cl ^- , Br ^- , SO ^2- ₄ or OH ^- ions

Quantum yields of nitrogen and hydrogen are recorded for the photolysis at 1849 $^\overset{\circ}{\mathrm A}$ of aqueous solutions of NaCl, KBr, Na$_2$SO$_4$, NaOH or HCl containing N$_2$O or CH$_3$OH or both. It is concluded: (i) That the extraction coefficients and quantum yields of hydrated electron formation are--Cl$^-$, 3800 $\pm$ 300 M$^{-1}$ cm$^{-1}$ and 0.43$\pm$0.02; Br$^-$, 13 000$\pm$ 1000 M$^{-1}$ cm$^{-1}$ and 0.34$\pm$0.02; SO~$^{4-}_2$, 260 $\pm$ 30M$^{-1}$ cm$^{-1}$ and 0.71 $\pm$ 0.04 and OH$^-$, 3600 $\pm$ 600 M$^{-1}$ cm$^{-1}$ and 0.11. (ii) That k(e~$^-_{aq\ldot}$ + H$^+$) = (1.49$\pm$_+0.16) x k(e$^-_{aq\ldot}$+ N$_2$O). (iii) That in alkaline solutions a chain oxidation of methanol by N$_2$O can occur. (iv) That the application of the Noyes (1955) equation leads to unacceptably large values of the root mean square diffusive displacement.