Dissociative Photodetachment Studies of I2-·Ar: Coincident Imaging of Two- and Three-Body Product Channels

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• 作者：Kathryn E. Kautzman ; Paul E. Crider ; David E. Szpunar ; Daniel M. Neumark
• 刊名：Journal of Physical Chemistry A
• 出版年：2007
• 出版时间：December 13, 2007
• 年：2007
• 卷：111
• 期：49
• 页码：12795 - 12801
• 全文大小：227K
• 年卷期：v.111,no.49(December 13, 2007)
• ISSN：1520-5215

文摘

Van der Waals clusters serve as prototypical systems for studying processes of energy transfer. The I₂·Arsystem has attracted particular interest due to the wide array of decay processes occurring in competitionwith one another. Here, we present systematic dissociative photodetachment (DPD) studies of the I₂^- andI₂^-·Ar anions in the region 4.24-4.78 eV. The resulting neutral fragments are detected by time- and position-sensitive (TPS) coincident imaging. Photofragment mass distributions and translational energy distributionsfrom the DPD of I₂^- are presented and facilitate understanding of the I₂·Ar system. For the I₂·Ar complex,channels resulting from two-body dissociation leading to I₂ + Ar photoproducts are observed at all photonenergies employed. We also report the first direct observation of the previously inferred three-body dissociationchannel leading to I + I + Ar photoproducts. The relative intensities of each decay channel are investigatedin relation to the electronic state being accessed. Translational energy distributions of the I₂·Ar complex lendfurther insight into the decay mechanism for each channel.