کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1686355 | 1010594 | 2008 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Dependence of resonant positron-molecule annihilation on molecular temperature
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سطوح، پوششها و فیلمها
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Dependence of resonant positron-molecule annihilation on molecular temperature Dependence of resonant positron-molecule annihilation on molecular temperature](/preview/png/1686355.png)
چکیده انگلیسی
Measurements of positron-on-molecule annihilation as a function of positron energy have established that positrons can bind to hydrocarbon molecules via vibrational Feshbach resonances. The magnitudes of these resonances, which grow rapidly with increasing molecular size, are still not well understood. In this paper, the role of molecular temperature is investigated using a specially designed temperature-regulated annihilation cell. Only relatively small changes in annihilation rate are observed when the molecular temperature is varied by a factor of two, from 300Â K down to approximately half that value for the alkane molecules pentane and heptane. These results place important constraints on theories of the annihilation rates and positron-molecule binding energies.
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 3, February 2008, Pages 478-482
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 266, Issue 3, February 2008, Pages 478-482
نویسندگان
J.A. Young, C.M. Surko,