Photodissociation dynamics of xylene isomers C6H4(CH3)2 at 157 nm using an ultracompact velocity map imaging spectrometer – The C7H7 channel

Dababrata Paul; Zhenghai Yang; Arthur G. Suits; David H. Parker; Ralf I. Kaiser

doi:10.1016/j.cplett.2022.140064

Photodissociation dynamics of xylene isomers C₆H₄(CH₃)₂ at 157 nm using an ultracompact velocity map imaging spectrometer – The C₇H₇ channel

Dababrata Paul, Zhenghai Yang, Arthur G. Suits, David H. Parker, Ralf I. Kaiser^*

^*Corresponding author for this work

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

Abstract

We investigated the photodissociation dynamics of three xylene isomers C₆H₄(CH₃)₂ at 157 nm. The center-of-mass translational energy distributions of C₇H₇ radicals were found to peak at 26 kJ mol⁻¹. Although the ionization energy of the C₇H₇ tolyl fragment exceeds the energy of a 157 nm photon, C₇H₇⁺ was observed as a result of the photoionization of vibrationally ‘hot’ tolyl (C₇H₇) radicals and/or two-photon ionization. The formation of rovibrationally excited tolyl fragments was discussed. Our experiments suggest the presence of tolyl radicals in the interstellar medium as a precursor to methylated polycyclic aromatic hydrocarbons upon reaction with vinylacetylene (C₄H₄).

Original language	English
Article number	140064
Journal	Chemical Physics Letters
Volume	807
DOIs	https://doi.org/10.1016/j.cplett.2022.140064
State	Published - 16 Nov 2022
Externally published	Yes

Keywords

Photodissociation dynamics
Tolyl radical
Ultracompact velocity map imaging spectrometer
Vacuum ultraviolet
Xylene

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10.1016/j.cplett.2022.140064

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@article{6329993b86a24dbb9481ef2bb9621649,

title = "Photodissociation dynamics of xylene isomers C6H4(CH3)2 at 157 nm using an ultracompact velocity map imaging spectrometer – The C7H7 channel",

abstract = "We investigated the photodissociation dynamics of three xylene isomers C6H4(CH3)2 at 157 nm. The center-of-mass translational energy distributions of C7H7 radicals were found to peak at 26 kJ mol−1. Although the ionization energy of the C7H7 tolyl fragment exceeds the energy of a 157 nm photon, C7H7+ was observed as a result of the photoionization of vibrationally {\textquoteleft}hot{\textquoteright} tolyl (C7H7) radicals and/or two-photon ionization. The formation of rovibrationally excited tolyl fragments was discussed. Our experiments suggest the presence of tolyl radicals in the interstellar medium as a precursor to methylated polycyclic aromatic hydrocarbons upon reaction with vinylacetylene (C4H4).",

keywords = "Photodissociation dynamics, Tolyl radical, Ultracompact velocity map imaging spectrometer, Vacuum ultraviolet, Xylene",

author = "Dababrata Paul and Zhenghai Yang and Suits, \{Arthur G.\} and Parker, \{David H.\} and Kaiser, \{Ralf I.\}",

note = "Publisher Copyright: {\textcopyright} 2022 Elsevier B.V.",

year = "2022",

month = nov,

day = "16",

doi = "10.1016/j.cplett.2022.140064",

language = "英语",

volume = "807",

journal = "Chemical Physics Letters",

issn = "0009-2614",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Photodissociation dynamics of xylene isomers C6H4(CH3)2 at 157 nm using an ultracompact velocity map imaging spectrometer – The C7H7 channel

AU - Paul, Dababrata

AU - Yang, Zhenghai

AU - Suits, Arthur G.

AU - Parker, David H.

AU - Kaiser, Ralf I.

PY - 2022/11/16

Y1 - 2022/11/16

N2 - We investigated the photodissociation dynamics of three xylene isomers C6H4(CH3)2 at 157 nm. The center-of-mass translational energy distributions of C7H7 radicals were found to peak at 26 kJ mol−1. Although the ionization energy of the C7H7 tolyl fragment exceeds the energy of a 157 nm photon, C7H7+ was observed as a result of the photoionization of vibrationally ‘hot’ tolyl (C7H7) radicals and/or two-photon ionization. The formation of rovibrationally excited tolyl fragments was discussed. Our experiments suggest the presence of tolyl radicals in the interstellar medium as a precursor to methylated polycyclic aromatic hydrocarbons upon reaction with vinylacetylene (C4H4).

AB - We investigated the photodissociation dynamics of three xylene isomers C6H4(CH3)2 at 157 nm. The center-of-mass translational energy distributions of C7H7 radicals were found to peak at 26 kJ mol−1. Although the ionization energy of the C7H7 tolyl fragment exceeds the energy of a 157 nm photon, C7H7+ was observed as a result of the photoionization of vibrationally ‘hot’ tolyl (C7H7) radicals and/or two-photon ionization. The formation of rovibrationally excited tolyl fragments was discussed. Our experiments suggest the presence of tolyl radicals in the interstellar medium as a precursor to methylated polycyclic aromatic hydrocarbons upon reaction with vinylacetylene (C4H4).

KW - Photodissociation dynamics

KW - Tolyl radical

KW - Ultracompact velocity map imaging spectrometer

KW - Vacuum ultraviolet

KW - Xylene

UR - https://www.scopus.com/pages/publications/85139004944

U2 - 10.1016/j.cplett.2022.140064

DO - 10.1016/j.cplett.2022.140064

M3 - 文章

AN - SCOPUS:85139004944

SN - 0009-2614

VL - 807

JO - Chemical Physics Letters

JF - Chemical Physics Letters

M1 - 140064

ER -

Photodissociation dynamics of xylene isomers C₆H₄(CH₃)₂ at 157 nm using an ultracompact velocity map imaging spectrometer – The C₇H₇ channel

Abstract

Keywords

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