Abstract
The electron-phonon relaxation times of the crystal-field levels of the metastable state5D4 of Tb3+ were measured between 2 and 4.2K. The relaxation of the lowest pseudodoublet (ΔE=1.25 cm−1) shows an Orbach process via higher crystal-field levels. The other levels show direct relaxation on a nanosecond time scale. The higher crystal-field levels were used to look for propagation of high-energy (ν≦4THz) nonequilibrium phonons by phonon-induced fluorescence. No ballistic propagation of high-energy phonons could be found.
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Bayerer, R., Schneider, W., Heber, J. et al. Electron-phonon relaxation in5D4 of Tb3+ in yttrium aluminium garnet. Z. Physik B - Condensed Matter 64, 195–199 (1986). https://doi.org/10.1007/BF01303702
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DOI: https://doi.org/10.1007/BF01303702