Ultraviolet absorption spectra and kinetics of acetonyl and acetonylperoxy radicals

R. A. Cox; Jette Munk; Ole John Nielsen; Palle Pagsberg; Emil Ratajczak

doi:10.1016/0009-2614(90)80079-S

Ultraviolet absorption spectra and kinetics of acetonyl and acetonylperoxy radicals

R. A. Cox^*, Jette Munk, Ole John Nielsen, Palle Pagsberg, Emil Ratajczak

^*Corresponding author for this work

38 Citations (Scopus)

Abstract

Acetonyl radicals and acetonylperoxy radicals were produced by pulse radiolysis of gas mixtures with varying concentrations of CH₃COCH₃ and O₂ in 1 atm of SF₆ to initiate the reactions (1) F+CH₃COCH₃→HF+CH₃COCH₂, (2) 2CH₃COCH₂ → products, (3) CH₃COCH₂+O₂(+M) → CH₃COCH₂O₂(+M) and (4) 2CH₃COCH₂O₂ → products. The ultraviolet absorption spectrum of the acetonyl radical is composed of a fairly weak band centered at 315 nm and a stronger band in the range of 200-250 nm. The absorption cross section has been determined, σ(310 nm) = (8.73 ± 0.50) × 10^-19 cm² molecule^-1. The values k₂=(4.8 ± 0.4) × 10^-11, k₃=(1.5 ± 0.3) × 10^-12 and k₄=(8.3 ± 1.6) × 10^-12 cm³ molecule^-1 s^-1 at 298 K were derived by computer modelling of the observed kinetic features.

Original language	English
Journal	Chemical Physics Letters
Volume	173
Issue number	2-3
Pages (from-to)	206-210
Number of pages	5
ISSN	0009-2614
DOIs	https://doi.org/10.1016/0009-2614(90)80079-S
Publication status	Published - 5 Oct 1990

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@article{e14b747cd46e41e0b477968a57625ec1,

title = "Ultraviolet absorption spectra and kinetics of acetonyl and acetonylperoxy radicals",

abstract = "Acetonyl radicals and acetonylperoxy radicals were produced by pulse radiolysis of gas mixtures with varying concentrations of CH3COCH3 and O2 in 1 atm of SF6 to initiate the reactions (1) F+CH3COCH3→HF+CH3COCH2, (2) 2CH3COCH2 → products, (3) CH3COCH2+O2(+M) → CH3COCH2O2(+M) and (4) 2CH3COCH2O2 → products. The ultraviolet absorption spectrum of the acetonyl radical is composed of a fairly weak band centered at 315 nm and a stronger band in the range of 200-250 nm. The absorption cross section has been determined, σ(310 nm) = (8.73 ± 0.50) × 10-19 cm2 molecule-1. The values k2=(4.8 ± 0.4) × 10-11, k3=(1.5 ± 0.3) × 10-12 and k4=(8.3 ± 1.6) × 10-12 cm3 molecule-1 s-1 at 298 K were derived by computer modelling of the observed kinetic features.",

author = "Cox, {R. A.} and Jette Munk and Nielsen, {Ole John} and Palle Pagsberg and Emil Ratajczak",

year = "1990",

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doi = "10.1016/0009-2614(90)80079-S",

language = "English",

volume = "173",

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journal = "Chemical Physics Letters",

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T1 - Ultraviolet absorption spectra and kinetics of acetonyl and acetonylperoxy radicals

AU - Cox, R. A.

AU - Munk, Jette

AU - Nielsen, Ole John

AU - Pagsberg, Palle

AU - Ratajczak, Emil

PY - 1990/10/5

Y1 - 1990/10/5

N2 - Acetonyl radicals and acetonylperoxy radicals were produced by pulse radiolysis of gas mixtures with varying concentrations of CH3COCH3 and O2 in 1 atm of SF6 to initiate the reactions (1) F+CH3COCH3→HF+CH3COCH2, (2) 2CH3COCH2 → products, (3) CH3COCH2+O2(+M) → CH3COCH2O2(+M) and (4) 2CH3COCH2O2 → products. The ultraviolet absorption spectrum of the acetonyl radical is composed of a fairly weak band centered at 315 nm and a stronger band in the range of 200-250 nm. The absorption cross section has been determined, σ(310 nm) = (8.73 ± 0.50) × 10-19 cm2 molecule-1. The values k2=(4.8 ± 0.4) × 10-11, k3=(1.5 ± 0.3) × 10-12 and k4=(8.3 ± 1.6) × 10-12 cm3 molecule-1 s-1 at 298 K were derived by computer modelling of the observed kinetic features.

AB - Acetonyl radicals and acetonylperoxy radicals were produced by pulse radiolysis of gas mixtures with varying concentrations of CH3COCH3 and O2 in 1 atm of SF6 to initiate the reactions (1) F+CH3COCH3→HF+CH3COCH2, (2) 2CH3COCH2 → products, (3) CH3COCH2+O2(+M) → CH3COCH2O2(+M) and (4) 2CH3COCH2O2 → products. The ultraviolet absorption spectrum of the acetonyl radical is composed of a fairly weak band centered at 315 nm and a stronger band in the range of 200-250 nm. The absorption cross section has been determined, σ(310 nm) = (8.73 ± 0.50) × 10-19 cm2 molecule-1. The values k2=(4.8 ± 0.4) × 10-11, k3=(1.5 ± 0.3) × 10-12 and k4=(8.3 ± 1.6) × 10-12 cm3 molecule-1 s-1 at 298 K were derived by computer modelling of the observed kinetic features.

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DO - 10.1016/0009-2614(90)80079-S

M3 - Journal article

AN - SCOPUS:0001474081

SN - 0009-2614

VL - 173

SP - 206

EP - 210

JO - Chemical Physics Letters

JF - Chemical Physics Letters

IS - 2-3

ER -

Ultraviolet absorption spectra and kinetics of acetonyl and acetonylperoxy radicals

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