Abstract

New evidence supporting the hydridic model of bonding in rare earth hydrides is reported. A weak peak was detected at the L III X-ray emission edge of lanthanum metal and assigned to transitions involving conduction band electrons, L IIIO IV.V and L IIIP I. The regular decrease in intensity at the L III emission edge with increasing hydrogen content and the close similarity of the emission edges of LaH 2·88, La 2O 3 and LaF 3 support the view that hydride ions form at the expense of the population of the lanthanum conduction band.

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