Magnetic circular dichroism of the thulium and erbium ethyl sulfate nonahydrate crystals

The magnetic circular dichroism and absorption spectra of the thulium and erbium ethyl sulfate nonahydrate crystals have been measured at low temperatures, down to 18 K. The analyses are made for five absorption bands of Tm(C2H5SO4)3.9H2O; the bands from the ground state, 3H6, to the excited states 3F3, 3F2, 1G4, 1D2, and 3P1 of Tm3+, and for four bands of Er(C2H5SO4)3.9H2O; the bands from the ground state, 4Isub(15/2), to the excited states 4Ssub(3/2), 4Fsub(5/2), 4Fsub(3/2), and 2Gsub(9/2) of Er3+. With the aid of the information about energy levels already obtained, the g values of the crystal levels relevant to absorptions are derived from the Farady parameters; these are in good agreement with those obtained by other methods. (auth.)