The absorption and fluorescence spectra of anhydrous DyCl3were investigated and the levels up to 37 000 cmmdash;1above the ground state established. Conclusive evidence is presented that the levels below 15 000 cmmdash;1belong to the6Hand6Fmultiplets. The Zeeman effects show considerable nonlinear interactions which follow quantitatively the existing theory. The 12 low levels and their electric and magnetic field splittings are reasonably well represented by the simplified theory withLhyphen;Scoupling, with the approximate crystal parametersB20=A20lang;r2rang; =89.8 cmmdash;1,B40=mdash;40.0 cmmdash;1,B60=mdash;23.3 cmmdash;1,B66=253 cmmdash;1.
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