...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physical chemistry chemical physics: PCCP >Strong combination-band IR emission from highly vibrationally excited acetylene
【24h】

Strong combination-band IR emission from highly vibrationally excited acetylene

机译：高度振动激发的乙炔产生强大的组合波段IR发射

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The v4 + v5 combination band, which appears relatively weak in the IR absorption spectrum, has been identified with exceptionally high intensity in the IR emission spectra from highly vibrationally excited acetylene, which is produced with～71 kcal mol~(-1) of vibrational energy from the 193 nm photolysis of vinyl bromide. The 'fundamental' transition of this combination band, from the (0,0,0,1~1,1~(-1)) level to the zero point, occurs at 1328 cm~(-1). The intensity and frequency of this band as well as the v3 and v5 bands, IR active but with lower emission intensity, as a function of the acetylene energy can be modeled accurately using the normal mode harmonic oscillator model with frequency anharmonicity corrections. Good fitting results are achieved even though the normal mode quantum numbers are no longer good for levels in the high energy region and the combination band is forbidden in the harmonic oscillator model. The identification of this intense combination band in emission, compared to its weak intensity in the absorption spectrum, highlights the necessity to include in consideration the combination bands for assignment of emission spectra in general and in particular emission from vibrationally hot acetylene which is ample in combustion, atmospheric, and interstellar environments.
机译：在红外吸收光谱中显得相对较弱的v4 + v5组合带，已被高度振动激发的乙炔以约71 kcal mol〜（-1）的振动产生的红外发射光谱中的高强度所鉴定。来自193 nm的乙烯基溴光解的能量。从（0,0,0,1〜1,1〜（-1））到零点的这个组合波段的``基本''过渡发生在1328 cm〜（-1）处。可以使用具有频率非谐波校正功能的普通模式谐波振荡器模型，准确地模拟该波段以及v3和v5波段（IR激活但发射强度较低）随乙炔能量变化的强度和频率。即使正常模式量子数不再适合高能区域的能级，并且在谐波振荡器模型中禁止了组合能带，也能获得良好的拟合结果。与在吸收光谱中较弱的强度相比，识别出该发射中的强结合带突出表明，有必要考虑一般用于确定发射光谱的结合带，特别是来自燃烧充分的振动热乙炔的发射，大气和星际环境。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号