Absorption spectrum of CfCl3

Abstract

The absorption spectrum of thin films of CfCIs was measured at 298, 77, and 4°K in the range 6000-46000 em-I. Interpretation of the results was based on systematic variation of energy level parameters over the actinide series. Electrostatic, spin-orbit, and configuration interaction terms were calculated by diagonalization of the complete interaction matrices and a least squares fitting process involving 27-level assignments. Compared to the energies of the firstf-+d transitions observed in lighter actinide trichlorides, the corresponding band in CfCIs appears to occur at an anomalously low energy.

Pressure-Induced Spectroscopic Changes in a Californium 1D Material Are Twice as Large as Found in the Holmium Analog

“…Upon cooling to −180 °C (Figure ), the transitions mentioned above show more definition due to the lack of thermal broadening. This is also seen in Carnall’s studies of actinide halides and matches closely to CfCl 3 . − Peak positions were assigned by fitting to Lorentzian curves. Since Cf-1 did not dissolve in typical solvents, solution absorption spectroscopy was not possible.…”

“…Figure displays the room temperature absorbance spectrum of Cf-1 showing clear 5f → 5f transitions of Cf 3+ from its primarily 6 H 15/2 ground state. , It must be noted that the spectrum of the Cf 3+ ion is complicated because of its multireference nature created from spin–orbit mixing of multiple states with the value of J . − Line groups are consistent with what is reported in the literature, including the most intense transitions from Line Groups F ( 4 P 5/2 , 4 K 17/2 ) and G ( 6 F 9/2 , 6 H 11/2 , 6 F 3/2 , 4 M 21/2 , 4 I 13/2 ) centered at 472 nm (21,172 cm –1 ) and 435 nm (22,992 cm –1 ), respectively. These groups have the highest optical densities of the Cf 3+ 5f → 5f transitions. ,,, Line Group E ( 6 H 7/2 , 6 F 5/2 , 6 H 15/2 ) consists of three distinct sets of peaks ranging from about 600 (16,666 cm –1 ) to 700 nm (14,285 cm –1 ). Groups C ( 2 H 11/2 ) and D­( 6 H 9/2 , 6 F 7/2 ) lie between 700 nm (14,285 cm –1 ) and 900 nm (11,111 cm –1 ), respectively.…”

Spectroscopic Properties of the f-Elements in Compounds and Solutions

“…On the other hand, if there is a distortion toward the AlC13(YC13)-phase which is characteristic of the heavy lanthanide chlorides [65] then having examined other cases we would expect that there would be increased intensity in the indicated hypersensitive transition. In our absorption spectra study of thin films of CfC1 3 [66] we identified the sample by xray analysis as exhibiting the hexagonal LaC1 3 -type structure. While there was no apparent increased intensity near 11400 cm-l relative to Cf 3 +(aquo), the 298 K spectra of the thin film were admittedly broad and diffuse and thus not definitive in this respect.…”

Synthesis, characterization, and high-pressure studies of a 3D berkelium(iii) carboxylate framework material

“…These are the Group C (11 000 cm À1 , 900 nm; 6 H 15/2 -2 H 11/2 ) and Group D (13 900 cm À1 , 720 nm; 6 H 15/2 -6 H 9/2 , 6 F 7/2 ) transitions for Cf 3+ . 31,33 This impurity is due to the high specific activity of 249 Bk that results in the ingrowth of 249 Cf at almost 1.5% per week. Since this experiment was completed 34 days after the initial Bk/Cf separation at ORNL that leads to the Cf content being roughly 6.8%.…”