X-RAY-SPECTRA AND ELECTRONIC-STRUCTURES OF RH AND (NH4)3RHCL6

With a two-crystal vacuum spectrometer, the Rh Lbeta2,15 emission spec trum in fluorescence from (NH4)3RhCl6 has been measured together with that from rhodium metal. The metal spectrum consists of a single broad band, while the (NH4)3RhCl6 spectrum is composed of a prominent peak and its low-energy shoulder. The measured Lbeta2,15 emission spectrum of Rh metal is compared with available X-ray photoelectron valence-ban d spectra and theoretical X-ray Lbeta2,15 emission spectra. It is show n that there is good agreement between them. The Rh Lbeta2,15 emission spectrum of (NH4)3RhCl6 is presented along with the Rh L(III) absorpt ion, Cl Kbeta emission and Cl K absorption spectra of this compound, r eported previously. These spectra are interpreted in terms of the mole cular orbitals of octahedral complex [RhCl6]3-.