Laser-ablated palladium,platinum, silver, and gold atoms react with molecular oxygen in excess neon during condensation at 4 K. Reaction products, M-(eta (2)-OO), M-(eta (2)-OO)(2) (M = Pd, Pt), PtO, PtO2, AuO2, M-(eta (1)-OO) (M = Ag, Au), and anions Ag-(eta (1)-OO)-, Au-(eta (1)-OO)(2)(-), are identified from isotopic shifts and splittings in their matrix infrared spectra. Density functional theory (BPW91 and B3LYP) calculations:are performed on the product molecules for comparison of calculated frequencies and O-16/O-18 isotopic ratios. Doping with CCl4 to serve as:an electron trap eliminates the anion bands, which further supports the anion identifications. The reaction mechanism and comparison with argon matrix experiments are discussed. The AuOO complex exhibits an unusually large neon-argon matrix shift, which suggests increased charge transfer in the more polarizable argon matrix.