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H atom yields in the pulse radiolysis of H2: Reactions with O2, CINO, and HI

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The hydrogen atom yield in the pulse radiolysis of H2 at high dose rates was measured by four independent calibration techniques, using reactions of H with O2, ClNO, and HI. Spectrophotometrical detection of HO2 in the reaction H + O2 + H2 → HO2 + H2 (1), of ClNO in H + ClNO → HCl + NO (2), of HI in H + HI → H2 + I (3), and of I2 in (3) followed by I + I + NO + H2 → I2 + NO + H2 allowed determination of the hydrogen yield in 1 bar of H2. The H atom yield was compared with the O3 yields in pure O2 and in O2/SF6 mixtures under identical irradiation conditions, which lead to relative G(H) values: G(H)H2 = 1.38G(O3)o2 and G(h)H2 = 2.07G(O3)O2/SF6. On the basis of G(O3)O2 = 12.8 a value G(H) = 17.6 is obtained. The rate constants of reactions 1, 2, and I + NO + H2 → INO + H2 (4) were measured as k1 = 2.17 × 1016 cm6 mol-2 s-1, k2 = 9.24 × 1012 cm3 mol-1 s-1, and k4 = 2.7 × 1015 cm6 mol-2 s-1.

OriginalsprogEngelsk
TidsskriftJournal of Physical Chemistry
Vol/bind86
Udgave nummer15
Sider (fra-til)2929-2935
Antal sider7
ISSN0022-3654
StatusUdgivet - 1 dec. 1982

ID: 214011446