浸渍钡钨阴极表面同步辐射光电子谱研究  

SRPES Study on Surface of Impregnated Barium Tungsten Cathodes

作　　者：阴生毅[1] 张洪来[1] 奎热西[2] 钱海杰[2] 王嘉欧[2] 王宇[1] 王欣欣[1] 

机构地区：[1]中国科学院电子学研究所,中国科学院高功率微波源与技术重点实验室,北京100190 [2]中国科学院高能物理研究所,北京100039

出　　处：《微波学报》2010年第S1期701-705,共5页Journal of Microwaves

基　　金：国家自然科学基金(60871053)

摘　　要：为了解浸渍钡钨阴极表面各元素的化学状态,采用同步辐射光电子谱技术对激活前后的阴极表面进行了研究。结果表明,与激活前相比,经1150℃×90min高温激活后,阴极表面吸附层厚度减薄,吸附C完全消失,O含量明显升高,W含量增加1倍,Ba含量增加2倍。另外,阴极表面的O1s、W4f和Ba3d等的谱峰均向高结合能方向显著位移。分析认为,激活后的阴极表面分布的吸附氧,使W基体以及阴极表面的Ba均产生吸附氧化,Ba在阴极表面主要以吸附化合物Bam·On(m≤n)的形式存在。In order to interpret the chemical state of elements on impregnated barium tungsten cathodes,synchrotron radiation photoelectron spectroscopy(SRPES)are used to investigate the surface of an impregnated barium tungsten cathode.The result indicates,compared with the situation before activation,after 1150℃×90min high temperature activation,the thickness of absorbed layer of cathode surface reduces remarkably,absorbed C disappears totally,O content rises obviously,W content increases at double, Ba content increases by 2 times on the barium tungsten cathode surface;In addition,the remarkable chemical shifts of spectrum peaks of elements such as O1s,W4f and Ba3d occur toward larger binding energy on the cathode surface.With further analysis,after activation,W surface and Ba atoms are absorbed and oxidized by absorbed oxygen distributing on the cathode surface,Ba exists in the form of absorbed chemical compound Bam·On (m≤n)

关 键 词：同步辐射光电子谱 浸渍钡钨阴极 结合能 化学位移 

分 类 号：O462[理学—电子物理学]