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- W2013752279 abstract "Abstract Site-selective and time-resolved fluorescence and excitation spectroscopy in the absorption bands of the M and N centers in CaF2 : Nd3+ (0.6%) were performed at 1.6 and 4.2 K using a pulsed tunable laser. The site-selective excitation and fluorescence spectra including the decay kinetics were studied for the crystal-field transitions 4 I 9/2 (1)→ 4 G 5/2 (1) in absorption and 4 F 3/2 (1)→ 4 I 9/2 (1) in emission for different Nd3+ centers. It is shown that the M absorption band mainly formed by (Nd3+–Fi)2 pair M centers contains also spectral lines of other pair modifications. Similarly, the N band includes not only lines from (Nd3+–Fi)4 quartet N centers but also from higher aggregated Q and R centers as well as from lower aggregated S centers. These centers have different excitation and fluorescence spectra and different 4 F 3/2 fluorescence lifetimes. The weak absorption between the M and N bands is due to numerous so-called D(2a) centers. An attempt to identify some of the new centers on the basis of their fluorescence lifetimes and nonradiative quenching rates was made. It was proved that the 4 I 9/2 (1) and the 4 G 5/2 (1) Stark levels in these centers split up into several sublevels. For the pair M and the quartet N centers the total splitting could be verified to be about 2.5 and 3.5 cm−1, respectively. Values of 5 and 6 cm−1 for the Q and Q′ centers and a value of 5 cm−1 for the R center were found." @default.
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- W2013752279 date "1999-09-01" @default.
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- W2013752279 title "Fluorescence line narrowing (FLN) and site-selective fluorescence decay of Nd3+ centers in CaF2" @default.
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- W2013752279 doi "https://doi.org/10.1016/s0022-2313(99)00024-1" @default.
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