کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1685752 1010574 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Selective detection of 13C by laser photodetachment mass spectrometry
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سطوح، پوشش‌ها و فیلم‌ها
پیش نمایش صفحه اول مقاله
Selective detection of 13C by laser photodetachment mass spectrometry
چکیده انگلیسی

In this paper, we demonstrate how laser photodetachment mass spectrometry (LPMS) can be used to selectively detect 13C− ions in the presence of 12C− ions in a low energy ion beam. An isotopically enriched beam of carbon ions consisting of equal amounts of 13C− and 12C− ions was extracted from an ion source. The ions interacted with a laser beam in a collinear geometry over a distance of 70 cm. Residual atoms produced in the photodetachment process were detected in a neutral particle detector placed downstream of the collinear interaction region. By making use of the Doppler effect we were able to selectively photodetach 13C− ions. The number of detected 13C atoms was 13 times larger than the number of detected 12C atoms. The population of the excited, weakly bound 2D excited state of the C− ion was depleted by the use of a second laser. This significantly reduced the background accompanying the signal arising from the photodetachment of the 4S ground state C− ion. Different applications of the LPMS method will be discussed in the paper.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 266, Issue 16, August 2008, Pages 3667–3673
نویسندگان
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