title: Persistent spectral hole-burning in the R(1) line of Cr(3+)-doped NaMg[Al(oxalate)(3)].9(H(2)O/D(2)O) induced by resonant energy transfer.
abstract: In the 3D network [Rh(bpy)(3)][NaCr(ox)(3)]ClO(4) (ox = oxalate, bpy = 2,2'-bipyridine) phonon-assisted as well as resonant energy migration within the R(1) line of the (4)A(2) --> (2)E transition of Cr(3+) has been identified. The latter is dominant below 4.2 K, and in a fluorescence line narrowing spectrum, it manifests itself in a multiline pattern across the inhomogeneous line width with spacings corresponding to the zero-field splitting of the (4)A(2) ground state (Milos, M.; Kairouani, S.; Rabaste, S.; Hauser, A. Coord. Chem. Rev. 2008, 252, 2540). H. Riesen demonstrated efficient spectral hole burning within the R(1) line of Cr(3+) doped at low concentrations into partially deuterated NaMg[Al(ox)(3)].9H(2)O (Riesen, H. Coord. Chem. Rev. 2006 250, 1737). Here we show that at higher Cr(3+) concentrations in the same host, both phenomena can be observed simultaneously, the resonant energy migration thus creating an additional series of persistent side holes.
authors.affiliation: Département de Chimie Physique, Université de Genève, Switzerland.
authors.forename: Mia
authors.initials: M
authors.lastname: Milos
authors.forename: Andreas
authors.initials: A
authors.lastname: Hauser