Dissociation dynamics of CH3I in electric spark induced breakdown revealed by time-resolved laser induced breakdown spectroscopy

Yang Wang; Wei Long Liu; Yun Fei Song; Li Ping Duo; Yu Qiang Liu; Yan Qiang Yang

doi:10.1016/j.chemphys.2014.11.024

Dissociation dynamics of CH₃I in electric spark induced breakdown revealed by time-resolved laser induced breakdown spectroscopy

Yang Wang
, Wei Long Liu
, Yun Fei Song
, Li Ping Duo
, Yu Qiang Liu
, Yan Qiang Yang^*

^*Corresponding author for this work

School of Physics

Harbin Institute of Technology
CAS - Dalian Institute of Chemical Physics
China Academy of Engineering Physics

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

The electric discharge spark dissociation of gas CH₃I is found to be similar to its femtosecond laser photodissociation. The almost identical spectra of the two processes show that their initial ionization conditions are very similar. The initial ionization followed by molecular fragmentation is proposed as the dissociation mechanism, in which the characteristic emissions of I⁺, CH₃, CH₂, CH, H, and I₂ are identified as the dissociation products. The emission band of 505 nm I₂ is clearly observed in the time-resolved laser induced breakdown spectroscopy (LIBS). The dynamic curve indicates that I₂^a- molecules are formed after the delay time of ∼4.7 ns. The formation of I₂^∗- molecule results from the bimolecular collision of the highly excited iodine atom I^∗-(⁴P) and CH₃I molecule. This dynamical information can help understand the process of electric discharge spark dissociation of CH₃I.

Original language	English
Pages (from-to)	30-35
Number of pages	6
Journal	Chemical Physics
Volume	447
DOIs	https://doi.org/10.1016/j.chemphys.2014.11.024
State	Published - 2 Feb 2015

Keywords

Dissociation dynamics
Electric spark induced breakdown
Emission band of I
Laser-induced breakdown spectroscopy
Methyl iodide

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10.1016/j.chemphys.2014.11.024

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title = "Dissociation dynamics of CH3I in electric spark induced breakdown revealed by time-resolved laser induced breakdown spectroscopy",

abstract = "The electric discharge spark dissociation of gas CH3I is found to be similar to its femtosecond laser photodissociation. The almost identical spectra of the two processes show that their initial ionization conditions are very similar. The initial ionization followed by molecular fragmentation is proposed as the dissociation mechanism, in which the characteristic emissions of I+, CH3, CH2, CH, H, and I2 are identified as the dissociation products. The emission band of 505 nm I2 is clearly observed in the time-resolved laser induced breakdown spectroscopy (LIBS). The dynamic curve indicates that I2a- molecules are formed after the delay time of ∼4.7 ns. The formation of I2∗- molecule results from the bimolecular collision of the highly excited iodine atom I∗-(4P) and CH3I molecule. This dynamical information can help understand the process of electric discharge spark dissociation of CH3I.",

keywords = "Dissociation dynamics, Electric spark induced breakdown, Emission band of I, Laser-induced breakdown spectroscopy, Methyl iodide",

author = "Yang Wang and Liu, \{Wei Long\} and Song, \{Yun Fei\} and Duo, \{Li Ping\} and Liu, \{Yu Qiang\} and Yang, \{Yan Qiang\}",

note = "Publisher Copyright: {\textcopyright} 2014 Elsevier B.V.",

year = "2015",

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day = "2",

doi = "10.1016/j.chemphys.2014.11.024",

language = "英语",

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T1 - Dissociation dynamics of CH3I in electric spark induced breakdown revealed by time-resolved laser induced breakdown spectroscopy

AU - Wang, Yang

AU - Liu, Wei Long

AU - Song, Yun Fei

AU - Duo, Li Ping

AU - Liu, Yu Qiang

AU - Yang, Yan Qiang

PY - 2015/2/2

Y1 - 2015/2/2

N2 - The electric discharge spark dissociation of gas CH3I is found to be similar to its femtosecond laser photodissociation. The almost identical spectra of the two processes show that their initial ionization conditions are very similar. The initial ionization followed by molecular fragmentation is proposed as the dissociation mechanism, in which the characteristic emissions of I+, CH3, CH2, CH, H, and I2 are identified as the dissociation products. The emission band of 505 nm I2 is clearly observed in the time-resolved laser induced breakdown spectroscopy (LIBS). The dynamic curve indicates that I2a- molecules are formed after the delay time of ∼4.7 ns. The formation of I2∗- molecule results from the bimolecular collision of the highly excited iodine atom I∗-(4P) and CH3I molecule. This dynamical information can help understand the process of electric discharge spark dissociation of CH3I.

AB - The electric discharge spark dissociation of gas CH3I is found to be similar to its femtosecond laser photodissociation. The almost identical spectra of the two processes show that their initial ionization conditions are very similar. The initial ionization followed by molecular fragmentation is proposed as the dissociation mechanism, in which the characteristic emissions of I+, CH3, CH2, CH, H, and I2 are identified as the dissociation products. The emission band of 505 nm I2 is clearly observed in the time-resolved laser induced breakdown spectroscopy (LIBS). The dynamic curve indicates that I2a- molecules are formed after the delay time of ∼4.7 ns. The formation of I2∗- molecule results from the bimolecular collision of the highly excited iodine atom I∗-(4P) and CH3I molecule. This dynamical information can help understand the process of electric discharge spark dissociation of CH3I.

KW - Dissociation dynamics

KW - Electric spark induced breakdown

KW - Emission band of I

KW - Laser-induced breakdown spectroscopy

KW - Methyl iodide

UR - https://www.scopus.com/pages/publications/84918795523

U2 - 10.1016/j.chemphys.2014.11.024

DO - 10.1016/j.chemphys.2014.11.024

M3 - 文章

AN - SCOPUS:84918795523

SN - 0301-0104

VL - 447

SP - 30

EP - 35

JO - Chemical Physics

JF - Chemical Physics

ER -

Dissociation dynamics of CH₃I in electric spark induced breakdown revealed by time-resolved laser induced breakdown spectroscopy

Abstract

Keywords

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