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Date: 26-12-2016
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Date: 10-3-2016
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Date: 24-3-2016
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Actinide Ions
The actinides are similar to the rare earths in having the 5 f electrons partially shielded by 6s and 6p electrons. Most of the actinide elements are radioactive, and only uranium in CaF2 has been successfully used in a laser. The host was doped with 0.05% uranium. Laser action occurred at 2.6μm between a metastable level and a terminal level some 515 cm−1 above the ground state.
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التوتر والسرطان.. علماء يحذرون من "صلة خطيرة"
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مرآة السيارة: مدى دقة عكسها للصورة الصحيحة
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نحو شراكة وطنية متكاملة.. الأمين العام للعتبة الحسينية يبحث مع وكيل وزارة الخارجية آفاق التعاون المؤسسي
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