Absorption cross sections and kinetic considerations of the IO radical as determined by laser flash photolysis/laser absorption spectroscopy

R. E. Stickel, Anthony J Hynes, J. D. Bradshaw, W. L. Chameides, D. D. Davis

Research output: Contribution to journalArticle

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Abstract

Independent measurements of the absorption cross section of the IO radical for the A2Π-X2Π band system are reported. A value of (3.1 ± 0.6) × 10-17 cm2 was observed for the (4,0) bandhead in good agreement with an earlier investigation. Results are also reported for the (5,0), (3,0), (2,0), and (1,0) bands over the wavelength range of 410-470 nm. However, no measurable (<2 × 10-18 cm2) absorption was found for the (0,0) band. The atmospheric photodissociation rate constant, JIO, for solar zenith angles of 0°-40° was calculated to have a value of 0.06 ± 0.01 s-1. This value is a factor of 5 lower than previous estimates. Finally, the rate coefficient for the reaction IO + IO → products (3) has been measured at 760 Torr of N2 and 300 K. The measured effective bimolecular rate constant was found to be (6.6 ± 2) × 10-11 cm3·molecule-1·s-1, in good agreement with recent results by Sander (1986).

Original languageEnglish (US)
Pages (from-to)1862-1864
Number of pages3
JournalJournal of Physical Chemistry
Volume92
Issue number7
StatePublished - 1988
Externally publishedYes

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Laser spectroscopy
Photolysis
laser spectroscopy
Absorption spectroscopy
absorption cross sections
flash
photolysis
Rate constants
absorption spectroscopy
Sanders
Photodissociation
Kinetics
Lasers
kinetics
lasers
zenith
Wavelength
photodissociation
coefficients
estimates

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Absorption cross sections and kinetic considerations of the IO radical as determined by laser flash photolysis/laser absorption spectroscopy. / Stickel, R. E.; Hynes, Anthony J; Bradshaw, J. D.; Chameides, W. L.; Davis, D. D.

In: Journal of Physical Chemistry, Vol. 92, No. 7, 1988, p. 1862-1864.

Research output: Contribution to journalArticle

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abstract = "Independent measurements of the absorption cross section of the IO radical for the A2Π-X2Π band system are reported. A value of (3.1 ± 0.6) × 10-17 cm2 was observed for the (4,0) bandhead in good agreement with an earlier investigation. Results are also reported for the (5,0), (3,0), (2,0), and (1,0) bands over the wavelength range of 410-470 nm. However, no measurable (<2 × 10-18 cm2) absorption was found for the (0,0) band. The atmospheric photodissociation rate constant, JIO, for solar zenith angles of 0°-40° was calculated to have a value of 0.06 ± 0.01 s-1. This value is a factor of 5 lower than previous estimates. Finally, the rate coefficient for the reaction IO + IO → products (3) has been measured at 760 Torr of N2 and 300 K. The measured effective bimolecular rate constant was found to be (6.6 ± 2) × 10-11 cm3·molecule-1·s-1, in good agreement with recent results by Sander (1986).",
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AU - Stickel, R. E.

AU - Hynes, Anthony J

AU - Bradshaw, J. D.

AU - Chameides, W. L.

AU - Davis, D. D.

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N2 - Independent measurements of the absorption cross section of the IO radical for the A2Π-X2Π band system are reported. A value of (3.1 ± 0.6) × 10-17 cm2 was observed for the (4,0) bandhead in good agreement with an earlier investigation. Results are also reported for the (5,0), (3,0), (2,0), and (1,0) bands over the wavelength range of 410-470 nm. However, no measurable (<2 × 10-18 cm2) absorption was found for the (0,0) band. The atmospheric photodissociation rate constant, JIO, for solar zenith angles of 0°-40° was calculated to have a value of 0.06 ± 0.01 s-1. This value is a factor of 5 lower than previous estimates. Finally, the rate coefficient for the reaction IO + IO → products (3) has been measured at 760 Torr of N2 and 300 K. The measured effective bimolecular rate constant was found to be (6.6 ± 2) × 10-11 cm3·molecule-1·s-1, in good agreement with recent results by Sander (1986).

AB - Independent measurements of the absorption cross section of the IO radical for the A2Π-X2Π band system are reported. A value of (3.1 ± 0.6) × 10-17 cm2 was observed for the (4,0) bandhead in good agreement with an earlier investigation. Results are also reported for the (5,0), (3,0), (2,0), and (1,0) bands over the wavelength range of 410-470 nm. However, no measurable (<2 × 10-18 cm2) absorption was found for the (0,0) band. The atmospheric photodissociation rate constant, JIO, for solar zenith angles of 0°-40° was calculated to have a value of 0.06 ± 0.01 s-1. This value is a factor of 5 lower than previous estimates. Finally, the rate coefficient for the reaction IO + IO → products (3) has been measured at 760 Torr of N2 and 300 K. The measured effective bimolecular rate constant was found to be (6.6 ± 2) × 10-11 cm3·molecule-1·s-1, in good agreement with recent results by Sander (1986).

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