کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1684868 1010540 2009 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Forward–backward correlation in secondary electron emission from a thin carbon foil by frozen-charged H+H+ and H0H0 penetration
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سطوح، پوشش‌ها و فیلم‌ها
پیش نمایش صفحه اول مقاله
Forward–backward correlation in secondary electron emission from a thin carbon foil by frozen-charged H+H+ and H0H0 penetration
چکیده انگلیسی

The statistical distributions of the number of simultaneously emitted secondary electrons (SE’s) from a thin carbon foil have been measured with frozen-charged H0H0 and H+H+ projectiles of 2.5–3.5 MeV. In this experiment, the forward- and backward-emitted electrons have been measured simultaneously together with foil-transmitted particles using a list-mode data taking system in order to investigate their correlation. From the two-dimensional spectra of the emitted SE’s, we have derived the probability distributions of the SE emission, P(nf,nb), where nfnf and nbnb represent the number of SE’s emitted simultaneously in the forward and backward directions, respectively. Compared with those for the H+H+ penetration, the emission probabilities for the H0H0 penetration exhibit quite different nfnf- and nbnb-dependence. Firstly, P(nf=0,nb=0) takes a remarkably large value. Secondly, among P(nf,nb)’s with nf+nb=(constant), P(nf≠0,nb=0) and P(nf=0,nb≠0) become the largest and the second largest probabilities. In contrast, such events that SE’s are emitted in both of the forward and backward directions happen with significantly smaller probabilities. These trends are common to all projectile energies measured and seem to be explained by the predominance of the high energy internal SE production for the H0H0 penetration due to the screening effect of its bound electron.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 267, Issue 16, 15 August 2009, Pages 2612–2615
نویسندگان
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