Photoelectron Imaging of Atomic Iodine Following A-Band Photolysis of CH3I

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• 作者：Changjin Hu ; Shixin Pei ; Yi-Li Chen ; Kopin Liu
• 刊名：Journal of Physical Chemistry A
• 出版年：2007
• 出版时间：July 26, 2007
• 年：2007
• 卷：111
• 期：29
• 页码：6813 - 6821
• 全文大小：854K
• 年卷期：v.111,no.29(July 26, 2007)
• ISSN：1520-5215

文摘

Photoionization of the iodine atom following methyl iodide A-band photodissociation was studied over thewavelength range of 245.5-261.6 nm by photoelectron imaging technique. Final state-specific speed andangular distributions of the photoelectron were recorded. Two types of the photoelectron resulted from ionizingthe I atom from the photodissociation of CH₃I were identified: (a) (2 + 1) REMPI of the ground state Iatom, and (b) two-photon excitation of spin-orbit excited I(²P_1/2) to autoionizing resonances converging tothe ³P₁ state of I⁺. In addition, some weaker signals were attributed to one-photon ionization of I atomsproduced in some higher excited states from multiphoton ionization of CH₃I followed by dissociation. Analysisof relative branching ratios to different levels of I⁺ (in case a) revealed that the final ion level distributionsare generally dominated by the preservation of the ion-core configuration of the intermediate resonant state.A qualitative interpretation of the electron angular distribution from an autoionization process is also given.