Study of radiation induced reaction in liquid carbon tetrachloride by means of picosecond pulse radiolysis

Pico- and nano-second pulse radiolysis was applied to the study of the radiolysis of carbon tetrachloride (CCl₄). In the u.v.-region, two different absorbing species were observed by using the twin linac pulse radiolysis technique. The component decays within 100 ps and the other component has a very long lifetime (about 100 ns). This long lifetime component has been reported in previous work. The absorption band of the very short lifetime component is broader than that of the long lifetime component in the u.v.-region. This very short lifetime component is considered to be CCl^{{plus sign, dot below}}₄. In the visible region, growth of absorption and following first order decay were observed. The growth of the absorption was measured very precisely using the twin linac pluse radiolysis and the analysis was carried out using the analytical solution of the Smoluchowski equation. Exponential function (R(r, r₀) = (1/r₀) exp(-r/r₀)) as the initial distribution function of the geminate ion pair gives a better fit than the gaussian. However using the reported G_fi/G_tot (0.02), even the exponential is still not fitted completely for the experimental results. A more complex initial distribution must be introduced.