Abstract
The absorption spectra of Er(C5H5)3 in 2-methyl tetrahydrofuran have been studied at room temperature, liquid-nitrogen, and liquid-helium temperature. Hypersensitive line groups have been found at ∼19 000 and ∼26 000 cm−1. Large splittings of J = 32 levels have also been observed. A correlation between hypersensitivity and large second-degree terms of the crystalline potential is suggested. Although some line groups in Er(C5H5)3 showed unusually large splittings, no drastic changes in the usual energy-level pattern for 4f11 were found in this volatile, organometallic compound of erbium.
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