ATOMIC AND MOLECULAR PHYSICS |
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Probing Ultrafast Dissociation Dynamics of Chloroiodomethane in the B Band by Time-Resolved Mass Spectrometry |
Yu-Zhu Liu1,2**, Jin-You Long3, Lin-Hua Xu1, Xiang-Yun Zhang1, Bing Zhang3 |
1School of Physics and Opto-electronics Engineering, Nanjing University of Information Science and Technology, Nanjing 210044 2Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology (CICAEET), Nanjing 210044 3State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071
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Cite this article: |
Yu-Zhu Liu, Jin-You Long, Lin-Hua Xu et al 2017 Chin. Phys. Lett. 34 033301 |
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Abstract Ultrafast dissociation dynamics of chloroiodomethane (CH$_{2}$ICl) in the B band is studied by femtosecond time-resolved time-of-flight (TOF) mass spectrometry. Time-resolved TOF mass signal of parent ion (CH$_{2}$ICl$^{+})$ and main daughter ion (CH$_{2}$Cl$^{+})$ are obtained. The curve for the transient signal of CH$_{2}$ICl$^{+}$ is simple and can be well fitted by an exponential decay convoluted with a Gaussian function. The decay constant determined to be less than 35 fs reflects the lifetime of the B band. Significant substituent effects on photodissociation dynamics of CH$_{2}$ICl compared with CH$_{3}$I are discussed. The dissociation time from the parent ion CH$_{2}$ICl$^{+}$ to the daughter ion CH$_{2}$Cl$^{+}$ is determined in the experiment. The optimized geometry of the ionic state of CH$_{2}$ICl and the ionization energy are calculated for further analysis of the measurements. In addition, compared with the parent ion, a new decay component with time constant of $\sim $596 fs is observed for CH$_{2}$Cl$^{+}$, and reasonable mechanisms are proposed for the explanation.
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Received: 16 November 2016
Published: 28 February 2017
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PACS: |
33.80.Gj
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(Diffuse spectra; predissociation, photodissociation)
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78.47.J-
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(Ultrafast spectroscopy (<1 psec))
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32.80.-t
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(Photoionization and excitation)
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Fund: Supported by the National Natural Science Foundation of China under Grant Nos 11304157, 21303255 and 11475229, the 'Six Talent Peaks' Project in Jiangsu Province under Grant No 2015-JNHB-011, and the College Students Practice Innovative Training Program of Nuist under Grant No 201610300042. |
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