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|Title:||Rare Earth Crystal Field Spectra as a Probe of Librational Motions in BaY2F8 Solid State Laser Crystals|
|Authors:||CAPELLETTI R.; BARALDI A.; BUFFAGNI E.; MAGNANI Nicola; MAZZERA M.|
|Citation:||Journal of Physics:Conference Series vol. 249 no. 1 p. 1-7|
|Publisher:||Institute of Physics Publishing (IOP)|
|Type:||Articles in periodicals and books|
|Abstract:||The fine structure (FS) accompanying a few lines, originated by crystal field (CF) transitions of rare earths (RE), as Er3+ and Tm3+, in BaY2F8 single crystals, is analyzed as a function of the RE3+ concentration (0.5÷20 at%) and temperature (9-300 K), by using high resolution (as fine as 0.02 cm-1) Fourier transform spectroscopy and linear dichroism measurements. The 9 K absorption spectra show that FS includes weak, narrow, and closely spaced (0.4÷0.8 cm-1) lines, covering a few cm-1 range on both sides of the narrowest among the CF lines. The FS increases by increasing the RE3+ concentration and vanishes at rather low temperature (40 and 60 K for Er3+ and Tm3+, respectively). The polarized light spectra confirm the association of a given set of FS lines to a specific CF line. The FS is ascribed to the simultaneous excitation of an electronic CF transition and of a local librational (or hindered rotation) mode of the RE3+-F- group. The attribution is supported 1) by specific features of the host matrix and guest rare earths, which allow some mobility of F- ions, and 2) by the spacing of the FS lines, which is in excellent agreement with the calculated RE3+-F- group rotational constant.|
|JRC Institute:||Nuclear Safety and Security|
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