Abstract
Hyperfine structure is observed on three transitions of the 5I8 → 5I7 absorption spectrum of the cubic-symmetry centre in CaF2:Ho3+. Hyperfine mixing between the two lowest levels of the 5I8 ground multiplet produces a complex and rich spectrum, which is only partially resolved. Simulated spectra are generated using one parameter to determine electronic crystal-field wavefunctions and one for the crystal-field splitting of the near-degenerate ground state. The simulated spectra correspond well with the measured spectra and demonstrate that the complex structure is well accounted for by dipole-hyperfine mixing between the lowest triplet and doublet states in the 5I8 ground multiplet.
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