The Electronic Spectrum of the CrO Ion in the Ca₂SiO₄ · CaCl₂ Host Lattice

Abstract

The polarised absorption spectrum of single crystals of Ca,SiO, + CaCI, containing chromium as CrOk or Crop is measured at 4.2 K in the range 8000 to 46000 cm-*. By a careful analysis based on a T, -D2d site symmetry perturbation and on the band polarisation behaviour, i t is concluded t h a t the observed spectrum is due to CrO:, the ground state is 2Ezz and the system of bands in the region 10000 to 20000 cm-l corresponds t o the ligandfield transition. Moreover all the observed bands except that a t 37730 cm-l correspond to a 2T, excited state.Le spectrum Blectronique polarisk de CrOi-ou Cr0:-dans les crystals de Ca,SiO, CaCI, a BtB mesure A la temperature de 4,2 K dans la region 8000 A 46000 cm-l. Avec une analyse precise stir le comportement dhduit de la polarisation en introduisant la perturbation de site T , + D2d on peut conclure que le spectre observe est d a ail C r o p , que 1'6tat fondamental est 2E,~ e t que toutes les bandes dans la region 10000 B 20000 cm-l sont dues B une transition de "Iigand field". Outre cela toutes les bandes, except6 celle i 37730 cm-l, sont dues aux Btats excites *T,.