| 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: |
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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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| [1] | Molina N J and Rowland F S 1974 Nature 249 810 | | [2] | Gitzinger G, Corrales M E, Loriot V, Amaral G A, Nalda R and Bañares L 2010 J. Chem. Phys. 132 234313 | | [3] | Wang Y, Shen H, Hua L, Hu C and Zhang B 2009 Opt. Express 17 10506 | | [4] | Thiré N, Cireasa R, Blanchet V and Pratt S T 2010 Phys. Chem. Chem. Phys. 12 15644 | | [5] | Zhang C H, Zhang Y, Zhang S and Zhang B 2009 Acta Phys. Chim. Sin. 25 1708 | | [6] | Kwok W M, Ma C, Parker A W, Phillips D, Towrie M, Matousek P, Zheng X and Phillips D L 2001 J. Chem. Phys. 114 7536 | | [7] | Zewail A H 2005 Science 307 558 | | [8] | Hertel I V and Radloff W 2006 Rep. Prog. Phys. 69 1897 | | [9] | Zugazagoitia J S, Collado-Fregoso E, Plaza-Medina E F and Peon J 2009 J. Phys. Chem. A 113 805 | | [10] | Minns R S, Parker D S N, Penfold T J, Worth G A and Fielding H H 2010 Phys. Chem. Chem. Phys. 12 15607 | | [11] | Richter M, Marquetand P, Gonzalez-Vázquez J, Sola I and Gonzalez L 2012 J. Phys. Chem. Lett. 3 3090 | | [12] | Liu Y, Knopp G, Sych Y, Radi P and Gerber T 2013 Phys. Chem. Chem. Phys. 15 18101 | | [13] | Martinez-Fernandez L, Corral I, Granucci G and Persicob M 2014 Chem. Sci. 5 1336 | | [14] | Ullrich S, Schultz T, Zgierskia M Z and Stolow A 2004 Phys. Chem. Chem. Phys. 6 2796 | | [15] | Liu Y, Tang B, Shen H, Zhang S and Zhang B 2010 Opt. Express 18 5791 | | [16] | Eppink A T J B and Parker D H 1997 Rev. Sci. Instrum. 68 3477 | | [17] | Senapati D, Kavita K and Das P K 2002 J. Phys. Chem. A 106 8479 | | [18] | Lee M and Kim M S 2006 Chem. Phys. Lett. 431 19 | | [19] | Frisch M J, Trucks G W, Schlegel H B et al 2009 Gaussian 09, Revision E. 01 (Wallingford: Gaussian Inc.) | | [20] | Knopp G, Beaud P, Radi P, Tulej M and Gerber T 2002 Femtochemistry and Femtobiology: Ultrafast Dynamics in Molecular Science (Singapore: World Scientific) p 116 |
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