The 8 K absorption spectrum of the manifold observed between 1825 and 1975 nm. A hot band with structure to the right of 1930 nm represents transitions from the excited Stark level at .
The 8 K absorption spectrum of the , multiplet manifolds observed between 532 and 545 nm. Relatively weak hot bands appear to the right of 540 and 542 nm.
The 8 K absorption spectrum of the manifold. Note the separation between the two groups of GSA. To the right of 640 and 645 nm are several relatively weak hot bands representing transitions from the excited Stark level at .
A survey spectrum of the 8 K absorption observed between 350 and 395 nm.
The fluorescence spectrum at 78 K representing transitions from the Stark levels in the manifold to the ground-state manifold . Peaks to the left of the peak labeled “1” represent transitions to the 43, 30, 5, and Stark levels of . The experimental energy and irreps shown in the energy-level scheme are found in Table III.
Fluorescence observed from the to and to between 740 and 770 nm at 293 K. The energy level structure and symmetry label assignments are given in Table III.
Wave function symmetries corresponding to each of the irreps.
Atomic and crystal-field energy parameters for the six different orientations of in YGG.
Calculated and experimentally observed energy levels for in YGG, along with irrep identifiers and largest wave function component for each energy level.
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