Photodissociation of O2 and CO2 from vibrationally excited states at high temperatures

Mitsuo Koshi; Masabumi Yoshimura; Hiroyuki Matsui

doi:10.1016/0009-2614(91)90248-8

Photodissociation of O₂ and CO₂ from vibrationally excited states at high temperatures

Mitsuo Koshi^*, Masabumi Yoshimura, Hiroyuki Matsui

^*Corresponding author for this work

Department of Applied Chemistry

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

27 Scopus citations

Abstract

Concentrations of O(³P) produced in the photodissociation of O₂ (excited by ArF and KrF lasers) and of CO₂ (ArF laser) were measured by using atomic resonance absorption spectroscopy behind reflected shock waves over 1600-2500 and 1500-2700 K temperature ranges, respectively. The Arrhenius temperature coefficients for the yield of O atoms were E_A = 30.9 ± 2.6 kcal/mol for photolysis of O₂ excited at 248 nm, and E_A = 13.6 ± 3.8 kcal/mol for CO₂ excited at 193 nm. The observed yield of O atoms and its time dependence in the photolysis of O₂ were found to agree very well with the calculation based on the RKR potentials for the transition, B ³Σ^- _u ← X ³Σ^- _g; it was concluded that the temperature dependence of the yield approximately represented population of the vibrationally excited states of energy E_v ≈ E_A.

Original language	English
Pages (from-to)	519-525
Number of pages	7
Journal	Chemical Physics Letters
Volume	176
Issue number	6
DOIs	https://doi.org/10.1016/0009-2614(91)90248-8
State	Published - 1 Feb 1991

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@article{139be968342b4069b39dfca440ad78ea,

title = "Photodissociation of O2 and CO2 from vibrationally excited states at high temperatures",

abstract = "Concentrations of O(3P) produced in the photodissociation of O2 (excited by ArF and KrF lasers) and of CO2 (ArF laser) were measured by using atomic resonance absorption spectroscopy behind reflected shock waves over 1600-2500 and 1500-2700 K temperature ranges, respectively. The Arrhenius temperature coefficients for the yield of O atoms were EA = 30.9 ± 2.6 kcal/mol for photolysis of O2 excited at 248 nm, and EA = 13.6 ± 3.8 kcal/mol for CO2 excited at 193 nm. The observed yield of O atoms and its time dependence in the photolysis of O2 were found to agree very well with the calculation based on the RKR potentials for the transition, B 3Σ- u ← X 3Σ- g; it was concluded that the temperature dependence of the yield approximately represented population of the vibrationally excited states of energy Ev ≈ EA.",

author = "Mitsuo Koshi and Masabumi Yoshimura and Hiroyuki Matsui",

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doi = "10.1016/0009-2614(91)90248-8",

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T1 - Photodissociation of O2 and CO2 from vibrationally excited states at high temperatures

AU - Koshi, Mitsuo

AU - Yoshimura, Masabumi

AU - Matsui, Hiroyuki

PY - 1991/2/1

Y1 - 1991/2/1

N2 - Concentrations of O(3P) produced in the photodissociation of O2 (excited by ArF and KrF lasers) and of CO2 (ArF laser) were measured by using atomic resonance absorption spectroscopy behind reflected shock waves over 1600-2500 and 1500-2700 K temperature ranges, respectively. The Arrhenius temperature coefficients for the yield of O atoms were EA = 30.9 ± 2.6 kcal/mol for photolysis of O2 excited at 248 nm, and EA = 13.6 ± 3.8 kcal/mol for CO2 excited at 193 nm. The observed yield of O atoms and its time dependence in the photolysis of O2 were found to agree very well with the calculation based on the RKR potentials for the transition, B 3Σ- u ← X 3Σ- g; it was concluded that the temperature dependence of the yield approximately represented population of the vibrationally excited states of energy Ev ≈ EA.

AB - Concentrations of O(3P) produced in the photodissociation of O2 (excited by ArF and KrF lasers) and of CO2 (ArF laser) were measured by using atomic resonance absorption spectroscopy behind reflected shock waves over 1600-2500 and 1500-2700 K temperature ranges, respectively. The Arrhenius temperature coefficients for the yield of O atoms were EA = 30.9 ± 2.6 kcal/mol for photolysis of O2 excited at 248 nm, and EA = 13.6 ± 3.8 kcal/mol for CO2 excited at 193 nm. The observed yield of O atoms and its time dependence in the photolysis of O2 were found to agree very well with the calculation based on the RKR potentials for the transition, B 3Σ- u ← X 3Σ- g; it was concluded that the temperature dependence of the yield approximately represented population of the vibrationally excited states of energy Ev ≈ EA.

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