pulse radiolysis technique was used to measure the UV absorption spectra of c-C₆H₁₁^. and (c-C₆H₁₁)O₂^. radicals over the ranges 230-290 and 220-300 nm, σ(c-C₆H₁₁^.)250nm = (7.0 ± 0.8) × 10^-18 and σ((cC₆H₁₁)O₂^.)_{250 nm} = (5.7 ± 0.6) × 10^-18 cm² molecule^-1. The rate constant for the self-reaction of c-C₆H₁₁^. radicals was k₃ = (3.0 ± 0.4) × 10^-11 cm³ molecule^-1 s^-1. The addition reaction of c-C⁶H₁₁^. radicals with O₂ proceeds with a rate constant k₂ = (1-3 ± 0.2) × 10^-11 cm³ molecule^-1 s^-1. Rate constants for reactions of (c-C₆H₁₁)O₂ radicals with NO and NO₂ were k₄ = (6.7 ± 0.9) × 10^-12 and k₅ = (9.5 ± 1.5) × 10^-12 cm³ molecule^-1 s^-1, respectively. FTIR-smog chamber techniques were used to record the IR spectrum of the peroxynitrate (c-C₆H₁₁)O₂NO₂, determine that the reaction between (c-C₆H₁₁)O₂^. radicals and NO produces a (16 ± 4)% yield of the nitrate (c-C₆H₁₁)ONO₂, and study the atmospheric fate of cyclohexoxy radicals. Decomposition via C-C bond scission and reaction with O₂ are competing fates of the cyclohexoxy radical. In 700-750 Torr total pressure at 296 ± 2K, the rate constant ratio k_decomp/k_O2 = (8.1 ± 1.5) × 10¹⁸ molecule cm^-3. At 296 K in 1 atm of air, 61% of cyclohexoxy radicals decompose and 39% react with O₂. These results are discussed with respect to the literature data concerning the atmospheric chemistry of cyclohexane and analogous compounds.