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振动态选择的NO^2+离子e3B2态解离生成氧离子通道的动力学
  • ISSN号:1000-6818
  • 期刊名称:《物理化学学报》
  • 时间:0
  • 分类:O643[理学—物理化学;理学—化学]
  • 作者机构:[1]中国科学技术大学化学物理系,合肥微尺度物质科学国家实验室筹,合肥230026, [2]中国科学技术大学,合肥同步辐射国家实验室,合肥230029
  • 相关基金:国家自然科学基金(10979042,21073173)和国家重点基础研究发展规划项目(973)(2007CB815204)资助
中文摘要:

结合最新的阈值光电子-光离子符合速度成像技术和同步辐射光电离,开展了振动态选择的NO^2+离子e3B2态解离动力学研究.在18.8-19.2eV范围内获得的NO^2+离子e3B2态的振动分辨阈值光电子谱与前人结果基本符合,而由e3B2态(0,0,0)和(1,0,0)振动能级解离生成的O+碎片离子的符合速度成像清楚地显示出多个圆环结构,表明解离过程中生成了多种具有不同速度的O+离子,对应中性解离碎片NO分子处于不同的内态.通过速度和角度积分,我们分别获得了解离过程中释放的总平动能分布和O+离子的角度分布,其中两振动态选择的NO^2+离子解离生成的NO分子X2π态振动分布十分相似,主要布居的振动量子数为3—5.解离释放的可资用能近似平均分配到碎片的平动能和内能,其中碎片总平动能约占52%,内能约占48%.此外,O+离子的各向异性参数口约为0.3,且不随NO(X2π)振动量子数而剧烈变化.

英文摘要:

The dissociation dynamics of vibrational state-selected NO; (e3B2) was investigated using threshold photoelectron-photoion coincidence velocity imaging and photoionization by synchrotron radiation. The vibrational resolution threshold photoelectron spectrum of NO; (e3B2) was recorded in the energy range of 18.8-19.2 eV and was consistent with previous measurements. Furthermore, the coincident velocity images of the O+ fragments that dissociated from the (0,0,0) and (1,0,0) vibronic levels of NO;(e3B2) showed a multi-ring structure, indicating that O+ fragments with different speeds were produced during dissociation as well as corresponding NO molecules with different internal energy distributions. The total kinetic energy released distributions and the angular distributions of O+ during dissociation were obtained subsequently from the images. The internal energy distributions of the NO (X2π) fragments that dissociated from the two vibrational states of NO;(e3B2) were very similar and consisted of 3-5 dominant populated vibronic levels. The available energy released from dissociation was found to be almost evenly distributed between the kinetic and internal energies of the fragments and, specifically, a total kinetic energy of 52% and an internal energy of 48% were obtained. In addition, the anisotropy parameter β, of the O+ fragments was about 0.3 and was hardly dependent on the vibrational quantum number of the NO(X2π) fragment.

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期刊信息
  • 《物理化学学报》
  • 中国科技核心期刊
  • 主管单位:中国科学技术协会
  • 主办单位:北京大学化学与分子工程学院承办
  • 主编:刘忠范
  • 地址:北京大学化学楼
  • 邮编:100871
  • 邮箱:whxb@pku.edu.cn
  • 电话:010-62751724
  • 国际标准刊号:ISSN:1000-6818
  • 国内统一刊号:ISSN:11-1892/O6
  • 邮发代号:82-163
  • 获奖情况:
  • 中文核心期刊
  • 国内外数据库收录:
  • 俄罗斯文摘杂志,美国化学文摘(网络版),荷兰文摘与引文数据库,美国科学引文索引(扩展库),英国科学文摘数据库,日本日本科学技术振兴机构数据库,中国中国科技核心期刊,中国北大核心期刊(2004版),中国北大核心期刊(2008版),中国北大核心期刊(2011版),中国北大核心期刊(2014版),英国英国皇家化学学会文摘,中国北大核心期刊(2000版)
  • 被引量:24781