| Abstract
| - Laser-ablated zinc and cadmium atoms were mixed uniformly with H2 and O2 in excess argon or neon andwith O2 in pure hydrogen or deuterium during deposition at 8 or 4 K. UV irradiation excites metal atoms toinsert into O2 producing OMO molecules (M = Zn, Cd), which react further with H2 to give the metalhydroxides M(OH)2 and HMOH. The M(OH)2 molecules were identified through O−H and M−O stretchingmodes with appropriate HD, D2, 16,18O2, and 18O2 isotopic shifts. The HMOH molecules were characterizedby O−H, M−H, and M−O stretching modes and an M−O−H bending mode, which were particularly strongin pure H2/D2. Analogous Zn and Cd atom reactions with H2O2 in excess argon produced the same M(OH)2absorptions. Density functional theory and MP2 calculations reproduce the IR spectra of these molecules.The bonding of Group 12 metal dihydroxides and comparison to Group 2 dihydroxides are discussed. Althoughthe Group 12 dihydroxide O−H stretching frequencies are lower, calculated charges show that the Group 2dihydroxide molecules are more ionic.
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