Abstract

For pt.I see ibid., vol.2, p.4685 (1990). The optical absorption spectrum of Ho3+ in (Ho0.1,Y0.9)AsO4 and HoAsO4 and its Zeeman effect in magnetic fields along the crystal c axis were studied between 11000 and 28000 cm-1 at temperatures below 2.2 K and up to 85 K. In addition to the commonly used linearly polarised spectra, circularly polarised spectra with light propagation along the direction of the magnetic field were taken to ascertain the symmetry types of the singlets of the excited terms. The data of almost all crystal-field components could be determined with great reliability.

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