| 碘代烷烃在532 nm激光作用下多光子电离解离机理 |
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| 引用本文： | 章莲蒂,魏杰,方黎,姜芸芸,张树东,郭文跃,张柏林,张冰,蔡继业.碘代烷烃在532 nm激光作用下多光子电离解离机理[J].化学学报,1999,57(1):22-28. |
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| 作者姓名： | 章莲蒂 魏杰 方黎 姜芸芸 张树东 郭文跃 张柏林 张冰 蔡继业 |
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| 作者单位： | 中国科学院安徽光学精密机械研究所激光光谱开放实验室,合肥,230031 |
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| 基金项目： | 国家自然科学基金资助课题 |
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| 摘 要： | 利用５３２ｎｍ的激光对碘代烷烃（碘甲烷、碘乙烷、碘代正丙异丙烷）分子作了多光了电离解离（ＭＰＩＤ）质谱（ＭＳ）研究，在５３２ｎｍ激光作用下，ＣＨ３Ｉ分子吸收５３２ｎｍ激光双光子的能量，进入Ａ带的ＩＡ２态，继续吸收光子上泵浦至电离态形成母体离子ＣＨ３Ｉ，然后再形成碎片离子；而其它几个碘代烷烃吸收双光子的能量进入Ａ带后均形成中性碎片，中性碎片再吸收光子经一系列电离解离形成碎片离子，此外，本文还通过对同
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| 关 键 词： | 多光子电离 碘代烷烃 飞行时间质谱 |
| 修稿时间： | 1997年12月18日 |
Multiphoton Ionization Mass Spectra of Alkyl Iodides at 532 nm |
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| ZHANG Lian-di,WEI Jie,FANG Li,JIANG Yun-Yun,ZHANG Shu-Dong,GUO Wen-Yue,Zhang Bo-lin,ZHANG Bing,CAI Ji-ye.Multiphoton Ionization Mass Spectra of Alkyl Iodides at 532 nm[J].Acta Chimica Sinica,1999,57(1):22-28. |
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| Authors: | ZHANG Lian-di WEI Jie FANG Li JIANG Yun-Yun ZHANG Shu-Dong GUO Wen-Yue Zhang Bo-lin ZHANG Bing CAI Ji-ye |
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| Abstract: | Multiphoton Ionization-Dissociation (MPID) Mass Spectra (MS) of alkyl iodides (including methyl iodide, ethyl iodide, n-propyl iodide and i-propyl iodide) are obtained using a time-of-flight mass spectrometer at 532 nm. It is found that all kinds of parent molecules are first two-photon resonantly excited to A-band. CH3I molecule is resonantly exited to 1A2 state of A-band, and its MPID belongs to parent-ion ladder mechanism. However other molecules are resonantly exited to A-band and then go through dissociation. Fragment ions are produced by ionization and dissociation of neutral fragments, Their MPID belongs to neutral-fragment photoionization mechanism. Moreover, the dissociation pathways of isopropyl cation are discussed through branching ratio analyses. |
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| Keywords: | multiphoton ionization alkyl iodides time-of-flight mass spectium |
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