A time-resolved laser photolysis broadband diode array experiment has been used to measure the absorption spectrum of the chlorine atom in aqueous solution formed after excimer laser photolysis of chloroacetone and hypochlorous acid at l ¼ 248 nm. Laser photolysis-long path laser absorption at l ¼ 325 nm (He/Cd) was then applied to determine the rate coefficients for the reactions of the chlorine atom atA correlation between the rate constants at T ¼ 298 K for all oxygenated hydrocarbons and the bond dissociation energy of the weakest C-H bond of(n ¼ 18, r ¼ 0.88) is derived. From temperature dependent measurements (temperature range from 288 to 328 K) the following Arrhenius expressions were derived:

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