Abstract

Direct evaluation of the dipole derivative μ′ for overlapping H 2 dimers is consistent with the vibron oscillator strength of ≈ 10 −5 at the 150 GPa transition of dense hydrogen. The angular anisotropy of μ′ follows closely the σ−σ ∗ overlap for charge transfer (CT) between closed-shell H 2 molecules. We relate electron-vibron coupling above 150 GPa to CT models for ion-radical solids and conjugated polymers.

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