Photochemical reactions of monomeric and dimeric radical cations of acetone in freon matrices at 77 K

Monomeric [λ_max ≃ 435 nm, ϵ_max ≃ (3.6 ± 0.6) × l0³ dm³ mol⁻¹ cm⁻¹ ] and dimeric [λ_max ≃ 715 nm, ϵ_max ≃ (9.4 ± 1.2) × l0³ dm³ mol⁻¹ cm⁻¹ ] radical cations of acetone in a freon matrix at 77 K under the action of light react to form matrix radical cations and acetonyl radicals CH₂COMe with quantum yields of Φ > (4.0 ± 1.0) × l0⁻³ and Φ > (2.0 ± 1.0) × l0⁻², respectively.