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The Purchase button will be displayed if model is available for purchase online at Analog Devices or one of our authorized distributors. Select the purchase button to display inventory availability and online purchase options. All rights reserved. Holsa sence of any impurity lines in the optical spectra confirmed parameters B 22 , B 42 , B 62 and B The use of the descending the XPD results.
The additional c. Optical absorption and luminescence measurements usually assume values close to zero. The complete 4f 6 configuration of spectrophotometer from to nm at selected the Eu 31 ion consists of Stark levels and, in order to temperatures between 10 and K using a closed circuit avoid computational problems, only the 49 Stark levels of helium cryostat. The instrument reproducibility was 0.
The sample tion. This naturally excludes the simulation of the free ion was prepared by compressing a mixture of the oxy- interactions but can be considered justified because of the cyanamide and KBr to a transparent disk of 1-mm thick- energetic isolation of the ground multiplet and the nature ness.
The luminescence spectra of the Pr 31 - and Eu 31 -doped The calculations were carried out with the computer lanthanum oxycyanamides were measured from to program REEL [7] which is capable of treating simul- nm at 77 K maintained by an immersion-type liquid N 2 taneously both free ion and c.
The luminescence was excited by a Carl Zeiss diagonalization and least-squares calculations. The stan- ILA Ar 1 ion laser at A Czerny-Turner type 1-m Jobin-Yvon double experimental and calculated energy level values was used monochromator and a Hamamatsu R detector were to evaluate the quality of the simulations. The resolution of the setup was better than 1 cm Results and discussion 2.
Phenomenological simulation of the energy level schemes From the interpretation of the optical absorption and luminescence spectra of La 2 O 2 CN 2 :Pr 31 Fig. The 3 H 5 and 1 S 0 within the 4f N electron configurations is composed of two levels could not be observed because they were out of the parts: one accounting for the free ion energy level structure wavelength range of the experimental setup.
In by the crystal field [5]. The effective Hamiltonian used in the luminescence spectrum of the Eu 31 -doped sample Fig. The other symbols are described elsewhere [5,6]. In this manner, the physical reality of the results can usually be ensured.
The C4v symmetry restricts the number of the c. Holsa those of the oxychlorides Table 1. The fourth B 4q and sixth rank B q6 parameters represent the mid- and long- range c. These parameter values differed significantly from the oxychloride ones, but were very similar to those of lanthanum oxymolybdate Table 2. The fourth and sixth rank parameters were also the least well- defined ones, as is seen from their estimated standard deviations Table 1.
This probably results from the sparsity of both observed energy level schemes only about a third of the total. In the case of the Eu 31 -doped sample, the values of the c. Despite the low values for these additional parameters, the RE 31 site symmetry is C2 Fig. Together with the oxynitrates, whose structure has not either been solved in a satisfactory manner, although a Because of the apparent similarities between the spectra tetragonal structure with the C4v symmetry has been of the oxycyanamides and LaOCl:Eu 31 [4], as well as suggested [14], the actual RE 31 site symmetry in the PrOCl [8], the energy level simulations were initially oxycyanamide could be even lower than C2v.
The No c. All the parameter compounds, and thus there are no c. Since the unit cell g, whose value was fixed to a customary cm 21 , volumes of the two doped oxycyanamides are practically because its value is greatly influenced by the position of the same, the c.
This was, symmetry method, the calculations carried out in the lower indeed, what was observed Table 1. However, the C2v symmetry yielded a satisfactory agreement between absolute values of the B 04 and B 26 parameters differ the experimental and calculated values with r. This is also reflected in the relative c. The correctness of k strength parameters S Table 1 [15], whose values the simulations was revealed by the absence of any large indicate that the mid- and long-range c.
The overall c. All in all, the results of the two simulations are consistent, even if there always is a possibility that the global minima were not obtained, which may occur rather frequently for symmet- ries as low as C2v and when a large number of energy level values are unknown. You need to reset your browser to accept cookies or to ask you if you want to accept cookies.
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