Excited configurations under pressure

In the next section the rare-earth compounds that have been studied by optical means under pressure so far will be reviewed. Then, after a brief introduction of the most commonly used high pressure device, the diamond anvil cell, sect. 4 presents a discussion of the pressure-induced changes of the crystal-field levels and their interpretation. In sects. 5 and 6 some aspects of the dynamical effects under pressure are discussed. These include lifetime and intensity measurements, the influence due to excited configurations and charge transfer bands, and the electron-phonon coupling. 

Under pressure, Gleason et al. (1993) observed a strong decrease of the 5D3 lifetime, which was attributed to a nonradiative transfer to the excited 4f75d1 configuration. This configuration... 

---