The three groups of fluorescent line spectra of Tb3+ in CaF2 “spectrum I” between the crystal-field split levels of the 5D4 and the 7F3, 7F4, and 7F5 free-ion states have been combined into energy-level schemes which tend to support a cubic crystal field symmetry and which give information on the crystal-field split-leve representations and energies to 5 cm−1 for a thin crystal.
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See Appendix.
The letters preceding the line numbers indicate the following relative line strengths: S—strong, W—weak, WW—very weak, WWW and WWWW—extremely weak, B—broad, BB—very broad. Broad lines have an observed accuracy which may be less than the 5 cm−1 tolerance of the other lines, which are all sharp. Subgroups A, B, and C are the same as the 3, 4, and 5 designation of Ref. 4.
Table II
Crystal field splittings and allowed transitions in an Oh field for J=3, 4, and 5 states.a
Allowed transitions
Γ1↔Γ4, Γ2↔Γ5, Γ3↔Γ4, Γ5
Γ4↔Γ4, Γ5 Γ5↔Γ5
Terminal state
Crystal-field split representation
Transitions from 5D4 state
Total number of allowed transitions from 5D state (observed) dev.
See Appendix.
The letters preceding the line numbers indicate the following relative line strengths: S—strong, W—weak, WW—very weak, WWW and WWWW—extremely weak, B—broad, BB—very broad. Broad lines have an observed accuracy which may be less than the 5 cm−1 tolerance of the other lines, which are all sharp. Subgroups A, B, and C are the same as the 3, 4, and 5 designation of Ref. 4.
Table II
Crystal field splittings and allowed transitions in an Oh field for J=3, 4, and 5 states.a
Allowed transitions
Γ1↔Γ4, Γ2↔Γ5, Γ3↔Γ4, Γ5
Γ4↔Γ4, Γ5 Γ5↔Γ5
Terminal state
Crystal-field split representation
Transitions from 5D4 state
Total number of allowed transitions from 5D state (observed) dev.
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