Time-resolved kinetic studies on quenching of C2 (d 3Πg) by alkanes and substituted methane molecules

Hailing Wang; Zhiqiang Zhu; Shaohua Zhang; Linsen Pei; Yang Chen

doi:10.1016/j.cplett.2005.02.127

Time-resolved kinetic studies on quenching of C₂ (d ³Π_g) by alkanes and substituted methane molecules

Hailing Wang, Zhiqiang Zhu, Shaohua Zhang, Linsen Pei, Yang Chen

University of Science and Technology of China

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

12 Scopus citations

Abstract

C₂ free radicals were produced by photolysis of selected precursors (C₂Cl₄) with the focused output from the fourth harmonic of a Nd: YAG laser at 266 nm. The generated C₂ (a ³Π_u) radicals were then electronically excited to the d³Π_g state with a Nd: YAG laser pumped dye laser at 516.5 nm in the (0,0) band of the C₂ (d³Π_g ← a³Π_u) transition. The rate constants k _q and averaged collision cross sections σ_q for collision quenching of C₂ (d³Π_g) by n-C _nH_2n+2 (n = 1-8) and CH_4-nCl_n (n = 2-4) were measured at room temperature (298 K) by time-resolved laser-induced fluorescence in cell at total pressure of about 15 Torr. Formation cross sections of complexes for the C₂ (d³Π_g) and quenchers were calculated by means of a collision complex model. It was shown that the quenching rates of C₂ (d³Π_g) by alkane molecules increase with the number of C-H bonds of the molecules, which is in agree with that of the measured quenching cross sections.

Original language	English
Pages (from-to)	217-221
Number of pages	5
Journal	Chemical Physics Letters
Volume	407
Issue number	1-3
DOIs	https://doi.org/10.1016/j.cplett.2005.02.127
State	Published - 17 May 2005
Externally published	Yes

Access to Document

10.1016/j.cplett.2005.02.127

Cite this

@article{c667e979675946d1afe6d31243e7095d,

title = "Time-resolved kinetic studies on quenching of C2 (d 3Πg) by alkanes and substituted methane molecules",

abstract = "C2 free radicals were produced by photolysis of selected precursors (C2Cl4) with the focused output from the fourth harmonic of a Nd: YAG laser at 266 nm. The generated C2 (a 3Πu) radicals were then electronically excited to the d3Πg state with a Nd: YAG laser pumped dye laser at 516.5 nm in the (0,0) band of the C2 (d3Πg ← a3Πu) transition. The rate constants k q and averaged collision cross sections σq for collision quenching of C2 (d3Πg) by n-C nH2n+2 (n = 1-8) and CH4-nCln (n = 2-4) were measured at room temperature (298 K) by time-resolved laser-induced fluorescence in cell at total pressure of about 15 Torr. Formation cross sections of complexes for the C2 (d3Πg) and quenchers were calculated by means of a collision complex model. It was shown that the quenching rates of C2 (d3Πg) by alkane molecules increase with the number of C-H bonds of the molecules, which is in agree with that of the measured quenching cross sections.",

author = "Hailing Wang and Zhiqiang Zhu and Shaohua Zhang and Linsen Pei and Yang Chen",

year = "2005",

month = may,

day = "17",

doi = "10.1016/j.cplett.2005.02.127",

language = "英语",

volume = "407",

pages = "217--221",

journal = "Chemical Physics Letters",

issn = "0009-2614",

publisher = "Elsevier B.V.",

number = "1-3",

}

TY - JOUR

T1 - Time-resolved kinetic studies on quenching of C2 (d 3Πg) by alkanes and substituted methane molecules

AU - Wang, Hailing

AU - Zhu, Zhiqiang

AU - Zhang, Shaohua

AU - Pei, Linsen

AU - Chen, Yang

PY - 2005/5/17

Y1 - 2005/5/17

N2 - C2 free radicals were produced by photolysis of selected precursors (C2Cl4) with the focused output from the fourth harmonic of a Nd: YAG laser at 266 nm. The generated C2 (a 3Πu) radicals were then electronically excited to the d3Πg state with a Nd: YAG laser pumped dye laser at 516.5 nm in the (0,0) band of the C2 (d3Πg ← a3Πu) transition. The rate constants k q and averaged collision cross sections σq for collision quenching of C2 (d3Πg) by n-C nH2n+2 (n = 1-8) and CH4-nCln (n = 2-4) were measured at room temperature (298 K) by time-resolved laser-induced fluorescence in cell at total pressure of about 15 Torr. Formation cross sections of complexes for the C2 (d3Πg) and quenchers were calculated by means of a collision complex model. It was shown that the quenching rates of C2 (d3Πg) by alkane molecules increase with the number of C-H bonds of the molecules, which is in agree with that of the measured quenching cross sections.

AB - C2 free radicals were produced by photolysis of selected precursors (C2Cl4) with the focused output from the fourth harmonic of a Nd: YAG laser at 266 nm. The generated C2 (a 3Πu) radicals were then electronically excited to the d3Πg state with a Nd: YAG laser pumped dye laser at 516.5 nm in the (0,0) band of the C2 (d3Πg ← a3Πu) transition. The rate constants k q and averaged collision cross sections σq for collision quenching of C2 (d3Πg) by n-C nH2n+2 (n = 1-8) and CH4-nCln (n = 2-4) were measured at room temperature (298 K) by time-resolved laser-induced fluorescence in cell at total pressure of about 15 Torr. Formation cross sections of complexes for the C2 (d3Πg) and quenchers were calculated by means of a collision complex model. It was shown that the quenching rates of C2 (d3Πg) by alkane molecules increase with the number of C-H bonds of the molecules, which is in agree with that of the measured quenching cross sections.

UR - https://www.scopus.com/pages/publications/17844366073

U2 - 10.1016/j.cplett.2005.02.127

DO - 10.1016/j.cplett.2005.02.127

M3 - 文章

AN - SCOPUS:17844366073

SN - 0009-2614

VL - 407

SP - 217

EP - 221

JO - Chemical Physics Letters

JF - Chemical Physics Letters

IS - 1-3

ER -

Time-resolved kinetic studies on quenching of C₂ (d ³Π_g) by alkanes and substituted methane molecules

Abstract

Access to Document

Other files and links

Fingerprint

Cite this