| Abstract
| - Laser-ablated Zn and Cd atoms react with molecular hydrogens upon condensation at 4.5 K to form themetal dihydride molecules in solid hydrogen and neon. Ultraviolet irradiation increases these absorptions byan order of magnitude. Natural zinc- and cadmium isotopic splittings are resolved in solid p-H2, o-D2, andHD. Weaker absorptions are assigned to the linear HMMH molecules and to metal cluster monohydrideswith the assistance of DFT calculations. Upon sublimation of the hydrogen or neon matrix, the metal dihydridemolecules polymerize into solid hydrides with broad absorption bands characteristic of hydrogen-bridgebonding.
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