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High-resolution photofragment translational spectroscopy for the UV photodissociation of C2H5I

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Abstract

The photodissociation of ethyl iodide at 279.71, 281.73, 304.02 and 304.67 nm has been studied on our new mini-photofragment translational spectrometer with a total flight path of only 5 cm. Some vibrational peaks are firstly resolved in the TOF spectra of I*(2 P 1/2) and I(2 P 3/2) channels. These vibrational peaks are assigned to the excitation states (v 2 = 0, 1, 2, …) of the umbrella mode (v 2, 540 cm−1) of the photofragment C2H5, and the distribution of the vibrational states is obtained. The dissociation energy has been determined to be D 0(C-I)=2.314 ± 0.03 eV. The energy partitioning of the available energy (E avl=E T+E int=E T+E V,R) calculated from our experimental data Ē int / E avl = 22.1% at 281.73 nm, 22.4% at 304.02 nm for the I* channel, and Ē int / E avl = 25.2% at 279.71 nm, 25.9% at 304.67 nm for the I channel, seem to be more reliable.

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Authors and Affiliations

  1. Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100080, China

    Bi WeiBin, Xu XiLing, Huang JianGou, Xiao DaoQing & Zhu QiHe

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  1. Bi WeiBin
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  2. Xu XiLing
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  3. Huang JianGou
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  4. Xiao DaoQing
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  5. Zhu QiHe
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Correspondence to Zhu QiHe.

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Supported by the National Natural Science Foundation of China (Grant No. 20433080)

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Bi, W., Xu, X., Huang, J. et al. High-resolution photofragment translational spectroscopy for the UV photodissociation of C2H5I. SCI CHINA SER B 50, 476–482 (2007). https://doi.org/10.1007/s11426-007-0071-3

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  • DOI: https://doi.org/10.1007/s11426-007-0071-3

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