کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1682179 1518655 2016 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
An exploratory study of recycled sputtering and CsF2− current enhancement for AMS
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سطوح، پوشش‌ها و فیلم‌ها
پیش نمایش صفحه اول مقاله
An exploratory study of recycled sputtering and CsF2− current enhancement for AMS
چکیده انگلیسی
The analysis of 135Cs/Cs ratios at levels below 10−12 by accelerator mass spectrometry (AMS) would preferably use commonly available negative ion injection systems. The sputter ion sources in these injectors should ideally produce currents of Cs− or Cs-containing molecular anions approaching μA levels from targets containing mg quantities of Cs. However, since Cs is the most electro-positive stable element in nature with a low electron affinity, the generation of large negative atomic, or molecular beams containing Cs, has been very challenging. In addition, the reduction of the interferences from the 135Ba isobar and the primary 133Cs+ beam used for sputtering are also necessary. The measurement of a wide range of the isotope ratios also requires the ion source memory of previous samples be minimized. This paper describes some progresses towards a potential solution of all these problems by recycled sputtering using fluorinating targets of PbF2 with mg CsF mixed in. The problems encountered indicate that considerable further studies and some redesign of the present ion sources will be desirable.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 366, 1 January 2016, Pages 96-103
نویسندگان
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