Me. Vonarx et al., RESONANT AND PHONON-ASSISTED EXCITATION-ENERGY TRANSFER IN THE R(1) LINE OF [CR(OX)(3)](3-), Physical review. B, Condensed matter, 54(22), 1996, pp. 15800-15807
In resonant fluorescence line narrowing (FLN) experiments in the R(1)
transition of the [Cr(ox)(3)](3-) chromophore in [Ru(bpy)(3)][NaAl:Cr(
1%)(ox)(3)] and [Rh(bpy)(3)][NaCr(ox)(3)]ClO4 multiline spectra are ob
served at 1.8 K, (ox=oxalate, bpy=2,2'-bipyridine). For [Rh(bpy)(3)][N
aCr(ox)(3)]ClO4 the number of lines and their relative intensities dep
end critically upon the excitation wavelength within the inhomogeneous
distribution, and in time-resolved FLN experiments additionally upon
the delay. This behavior is clear evidence for a resonant energy-trans
fer process. At 4.2 K the more common phonon-assisted process becomes
dominant, manifesting itself as spectral diffusion.