Berkelium absorption spectra

Figure 9. Absorption spectrum of berkelium(III) in aqueous HCl solution...

The absorption spectra of Bk(iii) and Bk(iv) hydroxides as suspensions in 1 m NaOH have been reported [111]. The solid-state absorption spectrum [112] and Raman spectrum [113] of berkelium(iii) orthophosphate have been obtained. Line lists of the absorption bands of two organoberkelium compounds, Bk(CsHs)3 [114] and [Bk(C5H5)2Cl]2 [115], have been published. 

In later work, the absorption spectra of Bk(III) and Bk(IV) were recorded in various media (95). New absorption bands were reported as the result of using larger quantities of berkelium-249 of higher purity than had been previously available. Observations of the spectrum of Bk(III) were extended further into the ultraviolet wavelength region (to 200 nm), and nine new absorption bands were reported (96). Later the absorption spectra of Bk(III) and Bk(IV) in 2 M perchloric and 0.5 M nitric acid solutions have been obtained (97). An interpretation of the low-energy bands in the solution absorption spectra of Bk(III) and Bk(IV) has been published (98). 

Berkelium(iii) orthophosphate has been prepared and characterized by x-ray powder diffraction and solid-state absorption and Raman spectroscopy [112, 113]. Analysis of the x-ray data has shown this compound to be isostructural with samarium and europium orthophosphates and to exhibit similar lattice parameters [112]. The structure type was confirmed by the direct correlation of the Raman spectrum of BkP04 with those of the isostructural lanthanide orthophosphates [113]. 

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