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Journal of Applied Spectroscopy

Influence of temperature upon the migration of excitation energy in model systems

Endre Lehoczki, E. Balint, J. Hevesi

Published Jan 1, 1972• 0 citations
Publisher
DOI
10.1007/bf00613642

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The time and temperature dependences of the probability of deactivation of the excited state of the Yb 3+ ions in mixed yttrium-ytterbium garnets of various compositions were investigated in the temperature range 1.7–300°K. An analysis indicated that these dependences were governed by the excitation energy migration, which was the "bottleneck" in the process of nonradiative deactivation of the excited state. A strong rise (by more than an order of magnitude) of the migration probability was observed when the temperature was raised from 1.7 to 4.2°K. The diffusion theory, applicable to migration processes in the case of homogeneous broadening of spectral lines, was generalized to inhomogeneous broadening. The theoretical results were in good agreement with the experimental data.
Electronically highly excited (Rydberg) atoms experience quantum state-changing interactions similar to Förster processes found in complex molecules, offering a model system to study the nature of dipole-mediated energy transport under the influence of a controlled environment. We demonstrate a nondestructive imaging method to monitor the migration of electronic excitations with high time and spatial resolution, using electromagnetically induced transparency on a background gas acting as an amplifier. The continuous spatial projection of the electronic quantum state under observation determines the many-body dynamics of the energy transport.