A pulse radiolysis technique was used to measure the UV absorption spectra of CH₂ClCHCl and CH₂ClCHClO₂ radicals over the range 230-300 nm. At 250 nm, σ(CH₂ClCHCl) = (1.7 ± 0.2) × 10^-18 and σ(CH₂ClCHClO₂) = (3.5 ± 0.5) × 10^-18 cm² molecule^-1. The observed self-reaction rate constant for CH₂ClCHCl radicals, defined as -d[CH₂ClCHCl]/dt = 2k₄[CH₂ClCHCl]² was k₄ = (2.0 ± 0.3) × 10^-11 cm³ molecule^-1 s^-1. The rate constant for reaction of CH₂ClCHCl radicals with O₂ in one bar of SF₆ diluent was (2.4 ± 0.3) × 10^-12 cm³ molecule^-1 s^-1. The rate constants for the reactions of CH₂ClCHClO₂ radicals with NO and NO₂ were k₅ ≥ 9 × 10^-12 and k₆ = (9.8 ± 0.6) × 10^-12 cm³ molecule^-1 s^-1, respectively. The rate constant for the reaction of F atoms with CH₂ClCH₂Cl was k₃ = (2.6 ± 0.2) × 10^-11 cm³ molecule^-1 s^-1. The reaction of CH₂ClCHClO₂ radicals with NO produced NO₂ and, by implication, CH₂ClCHClO radicals. A FTIR spectroscopic technique showed that CH₂ClCHClO radicals undergo both reaction with O₂ and decomposition via intramolecular 3-center HCl elimination. In 700 Torr of air at 296 K the rate constant ratio K_O2/k_decomp = (2.3 ± 0.2) × 10^-20 cm³ molecule^-1. A lower limit of 4 × 10⁵ s^-1 was deduced for the rate of intramolecular 3-center HCl elimination from CH₂ClCHClO radicals at 296 K in 1 bar of SF₆ diluent. As part of this work a relative rate technique was used to measure rate constants of (1.3 ± 0.2) × 10^-12 and (6.4 ± 1.4) × 10^-14 cm³ molecule^-1 s^-1 for the reactions of Cl atoms with CH₂ClCH₂Cl and CH₂ClC(O)Cl, respectively. All experiments were performed at 296 K. Results are discussed in the context of the atmospheric chemistry of 1,2-dichloroethane.