By CK-12 Foundation
CK-12's Trigonometry-Second version is an advent to trigonometry for the highschool pupil. issues comprise: Trigonometric Identities and Equations, round services, Polar Equations and intricate Numbers.
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Additional info for CK-12 Trigonometry
For 5% Eu in BaMgF4 the efficiency under x- was found to be five times greater than that of the commercial sample. BaMgF4:Ce 3+ , Tb3+ We have recently reported the luminescence of Ce3+ ion in BaMgF4. Efficient energy transfer from Ce3 + Tb3+ ion is observed 3+ 3+ BaMgF4:Ce , Tb in the doubly doped ion to system . CexTb MgF4 where y=5 m/o Y 15, and 20 m/o were prepared. The and x = 2 , 5, 7, 10, excitation spectrum for Tb3+ emission shows a broad Ce3+ Samples of composition Bal,x,y band at 300 nm accompanied by weak f-f Tb3+ excitation lines in Emission cient 5 the 340-380 nm wavelength spectra for Ce Tb region (Figure 4 ) .
The experimental results show that centers A and B are impurity related, while C and D are relatively isolated. Q/(W +W ) , r r nr ' where N is the concentration of the center, σ is the absorption cross section, W r and W n r are the radiative and non-radiative transition rates, respectively. It is known from the measured lifetimes (*4—6 ys) that W +W are of the same order of magnitude for all centers. So & r nr are the radiative transition rates. Therefore, the intensity of the rare earth fluorescence is dominated by the product Ν·σ.
Lett. 3,554 (1984). NARASIMHA REDDY, Paper to be presented at 5th International conference on "Solid state ionic at Lake Tohe California USA 18-24 Aug. 1985. M. Srivastava, A. Y. 11201 ABSTRACT Luminescence of BaMgF,, doped with Eu been , Ce , Tb has studied under UV and X-ray excitation at 300 K and 2+ Observation of Eu line emission and energy transfer 77K. is discussed. INTRODUCTION Compounds of the type BaMF. (M=Mn, Fé, Co, Ni, Znf Mg) crystallize in the orthorhombic system with the space group 2 Ba + ions are surrounded by eight F ions.