中国科学院大连化学物理研究所机构知识库
Advanced  
DICP OpenIR  > 中国科学院大连化学物理研究所  > 期刊论文
题名: Chemisorption and reaction characteristics of methyl radicals on Cu(110)
作者: Zhai, RS;  Chan, YL;  Chuang, P;  Hsu, CK;  Mukherjee, M;  Chuang, TJ;  Klauser, R
刊名: LANGMUIR
发表日期: 2004-04-27
DOI: 10.1021/la036294u
卷: 20, 期:9, 页:3623-3631
收录类别: SCI
文章类型: Article
项目归属: 502
产权排名: 2;1
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Multidisciplinary ;  Chemistry, Physical ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Materials Science
英文摘要: Methyl radicals are generated by pyrolysis of azomethane, and the condition for achieving neat adsorption on Cu(110) is described for studying their chemisorption and reaction characteristics. The radical-surface system is examined by X-ray photoemission spectroscopy, ultraviolet photoemission spectroscopy, temperature-programmed desorption, low-energy electron diffraction (LEED), and high-resolution electron energy loss spectroscopy under ultrahigh vacuum conditions. It is observed that a small fraction of impinging CH3 radicals decompose into methylene possibly on surface defect sites. This type of CH2 radical has no apparent effect on CH3(ads) surface chemistry initiated by dehydrogenation to form active CH2(ads) followed by chain reactions to yield high-mass alkyl products. All thermal desorption products, such as H-2, CH4, C2H4, C2H6, and C3H6, are detected with a single desorption peak near 475 K. The product yields increase with surface coverage until saturation corresponding to 0.50 monolayer of CH3(ads). The mass distribution is, however, invariant with initial CH3(ads) coverage, and all desorbed species exhibit first-order reaction kinetics. LEED measurement reveals a c(2 x 2) adsorbate structure independent of the amount of gaseous exposure. This strongly suggests that the radicals aggregate into close-packed two-dimensional islands at any exposure. The islanding behavior can be correlated with the reaction kinetics and is deemed to be essential for the chain propagation reactions. Some relevant aspects of the CH3/Cu(111) system are also presented. The new results are compared with those of prior studies employing methyl halides as radical sources. Major differences are found in the product distribution and desorption kinetics, and these are attributed to the influence of surface halogen atoms present in those earlier investigations.
关键词[WOS]: ALKYL HALIDE PHOTOCHEMISTRY ;  ENERGY-LOSS SPECTROSCOPY ;  SURFACE-CHEMISTRY ;  CHAIN PROPAGATION ;  THERMAL-DECOMPOSITION ;  ADSORPTION GEOMETRY ;  COADSORBED IODINE ;  BOND FORMATION ;  CH3 ;  OXYGEN
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000221022400025
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/81741
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

Files in This Item: Download All
File Name/ File Size Content Type Version Access License
2004UM27ORNXCV.pdf(238KB)----开放获取--View Download

作者单位: 1.Natl Taiwan Univ, Ctr Condensed Matter Sci, Taipei 116023, Taiwan
2.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
3.Saha Inst Nucl Phys, Surface Phys Div, Kolkata 700064, W Bengal, India
4.Natl Synchrotron Radiat Res Ctr, Hsinchu 300, Taiwan

Recommended Citation:
Zhai, RS,Chan, YL,Chuang, P,et al. Chemisorption and reaction characteristics of methyl radicals on Cu(110)[J]. LANGMUIR,2004,20(9):3623-3631.
Service
 Recommend this item
 Sava as my favorate item
 Show this item's statistics
 Export Endnote File
Google Scholar
 Similar articles in Google Scholar
 [Zhai, RS]'s Articles
 [Chan, YL]'s Articles
 [Chuang, P]'s Articles
CSDL cross search
 Similar articles in CSDL Cross Search
 [Zhai, RS]‘s Articles
 [Chan, YL]‘s Articles
 [Chuang, P]‘s Articles
Related Copyright Policies
Null
Social Bookmarking
  Add to CiteULike  Add to Connotea  Add to Del.icio.us  Add to Digg  Add to Reddit 
文件名: 2004UM27ORNXCV.pdf
格式: Adobe PDF
此文件暂不支持浏览
所有评论 (0)
暂无评论
 
评注功能仅针对注册用户开放,请您登录
您对该条目有什么异议,请填写以下表单,管理员会尽快联系您。
内 容:
Email:  *
单位:
验证码:   刷新
您在IR的使用过程中有什么好的想法或者建议可以反馈给我们。
标 题:
 *
内 容:
Email:  *
验证码:   刷新

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.

 

 

Valid XHTML 1.0!
Powered by CSpace