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Date: 14-4-2016
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Date: 16-3-2016
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Date: 10-3-2016
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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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دخلت غرفة فنسيت ماذا تريد من داخلها.. خبير يفسر الحالة
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ثورة طبية.. ابتكار أصغر جهاز لتنظيم ضربات القلب في العالم
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العتبة العباسية المقدسة تستعد لإطلاق الحفل المركزي لتخرج طلبة الجامعات العراقية
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