Adsorption of various isotopic modifications of ozone was performed at 80 K and followed by infrared spectroscopy, on silica activated at 923 K. Hydrogen-bonded species were formed and the surface hydroxyls frequency shift indicated that ozone basicity is close to that of CO. Most of the fundamentals, overtones, and combination bands of adsorbed ozone were detected. Their wavenumbers were close to those observed for ozone dissolved in liquid oxygen or physisorbed on methoxylated silica. Adsorption of ¹⁶O¹⁸O¹⁸O indicated that hydrogen bonding occurred via one of the terminal oxygen atoms rather than via the O₃ oxygen central atom.