The high temperature generation and ESR investigation of ScH2, YH2, and YD2 radicals in rare gas matrices: A nonequilibrium vaporization technique for solid samples

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Abstract
The ScH2, YH2, and YD2 radicals have been generated from metal hydride powders at high temperatures by a nonequilibrium vaporization technique. The MH2 radicals were isolated in rare gas matrices at 12 K and investigated by electron spin resonance (ESR). The vaporization procedure has potential applications for the production of other vapor species which are difficult to generate by conventional means. The electronic structure, geometry, and ground state of these dihydride radicals were estimated from the ESR results and compared with recent theoretical conclusions. The metal ’’d’’ electron was found not to participate significantly in the M–H bond. These findings for MH2 are compared with recent results for ScF2 and YF2. The magnetic parameters for ScH2 are g∥ = 1.980 (1), g⊥ = 1.987 (1), A∥(45Sc) = −212 (2) MHz, A⊥(45Sc) = −128, ‖Aiso‖(H) = 12 (2). For YH2, g⊥ = 1.991 (1), A⊥(89Y) = −40 (10) MHz, ‖A⊥‖ (H) = 13 (2) MHz.

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