4f-5d Transitions of Tb^<3+> and Ce^<3+> in Calcite-Type MBO_3 (M=Sc, In and Lu)
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Excitation spectra for Tb^<3+> and Ce^<3+> as well as fluorescence spectra for Ce^<3+> due to 4f-5d transitions in calcite-type borates have been measured at liquid helium temperature. Sharp no-phonon lines are accompanied by phonon sidebands extending over 3500 cm^<-1>. The vibronic sidebands are considered to reflect vibrations of pure lattices. The spin-allowed 4f-5d transitions of Tb^<3+> and Ce^<3+> are accompanied by phonon sidebands due to even-parity lattice vibrations. The spin-forbidden 4f-5d vibronic sidebands of Tb^<3+> are due to odd-parity lattice vibrations. Models of the coupling schemes of the 4f^75d and 5d configurations in the crystal field are presented. A comparison of the observed spectra with the models suggests that the 5d electron may not see the trigonal component of the crystal field. Transition matrix elements between the ground 4f state and the Stark components of the excited 5d states of Ce^<3+> are calculated.
- 社団法人日本物理学会の論文
- 1972-03-05
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