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The assignment of the various transitions forming the spectrum of Fig. 8 is as follows [compare also with Fig. 4]. Peaks I and II correspond to the two possible transitions between the S=0 and S=1 multiplets: 0,0 → 1,0 and 0,0 → 1,±1. The peaks III, IV, and V arise from the five transitions between the S=1 and S=2 multiplets. In order of increasing energy, peak IV: 1,±1 → 2,0 and 1,±1 → 2,±1, peak V: 1,±1 → 2,±2, peak III: 1,0 → 2,0 and 1,0 → 2,±1. Finally, peak VI is produced by six of the eight possible transitions between the S=2 and S=3 multiplets: 2,±1 → 3,0, 2,0 → 3,0, 2,±1 → 3,±1, 2,0 → 3,±1, 2,±2 → 3,±3, and 2,±1 → 3,±2. Concerning the two remaining transitions, transition 2,±2 → 3,±1 (at 2.30 meV) coincides with the transition 1,0 → 2,±1 within the resolution of Fig. 8, and transition 2,±2 → 3,±2 appears as a weak satellite to peak III at 2.52 meV.
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