Emission spectra from the parity-allowed electronic transitions between the lowest crystal field level of the 6d 1 configuration to all the electronic levels of the 5f1 configuration of Pa 4 + diluted into single crystals of CS 2 ZrCl 6 at 4.2 K show highly structured vibronic sidebands. Vibronic progressions are seen along the 310 cm .. 1 totally symmetric stretch of the PaCI~complex. Most vibronic peaks correspond to even parity vibrations of the PaCI~ -complex or the host lattice. Additionally, electronic Raman scattering was observed between the two lowest crystal field levels of the 5f1 configuration by exciting with an argon ion laser in near resonance with the lowest level of the 6d I configuration.
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