کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5422644 1507920 2013 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Matrix effects in the neutralization of He ions at a metal surface containing oxygen
ترجمه فارسی عنوان
اثرات ماتریکس در خنثی سازی یون های آنها در سطح فلز حاوی اکسیژن است
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
چکیده انگلیسی

Charge exchange between He ions and a Ni(111) surface containing oxygen was studied by Low-Energy Ion Scattering, using 1.25 keV He+ as primary ions. The energy resolved yield of positive ions was detected after backscattering from Ni or O for different exposures of Ni(111) to molecular oxygen. Pronounced changes in the neutralization efficiency due to the presence of oxygen are observed for both, the adsorbate phase at low oxygen dose, and the NiO phase at high dose. The presence of O in the surface makes resonant charge transfer in a close collision possible. Evidence for a strong matrix effect is found: O in NiO neutralizes much more efficiently than O in the adsorbate phase. Independently, the different interaction stages of Ni-O and the surface structure were monitored by Photoelectron-Emission-Microscopy and Low-Energy Electron Diffraction.

► We investigate charge exchange between He ions and Ni(111) containing oxygen. ► Low-Energy Ion Scattering, using 1.25 keV He+ ions is applied. ► Pronounced changes in the neutralization efficiency due to oxygen are observed. ► We find strong matrix effects in ion yields for Ni-O (adsorbate) and NiO (oxide).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 609, March 2013, Pages 167-171
نویسندگان
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