کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5424557 | 1395828 | 2008 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Investigation of D(H) abstraction by means of high resolution electron energy loss spectroscopy Investigation of D(H) abstraction by means of high resolution electron energy loss spectroscopy](/preview/png/5424557.png)
In this work, we study the abstraction of deuterium (D) by hydrogen (H) atoms (respectively H by D) on both perfectly crystalline and ion bombarded graphite surfaces using high resolution electron energy loss spectroscopy. On an initially defect free graphite surface, abstraction of D by H (reciprocally and reversibly H by D) is a quite efficient process at room temperature. Measurements demonstrate that the abstraction occurs almost essentially with the adsorbed atoms on “weakly” reactive sites. Reciprocally, atoms adsorbed on defects with sp3 configuration participate in a much lower extent to the abstraction mechanism. Obviously, this phenomenon always occurs when exposing a surface to an atomic hydrogen beam and illustrates the competition between sticking and molecules formation by abstraction.
Journal: Surface Science - Volume 602, Issue 13, 1 July 2008, Pages 2311-2314