Investigation of the Pressure Dependence of SO3 Formation

The kinetics of the pressure dependent O + SO2 + Ar reaction have been investigated using laser photolysis resonance fluorescence at temperatures of 289 K, 399 K, 581 K, 699 K, 842 K and 1040 K and at pressures from 30-665 torr. Falloff was observed for the first time in the pressure dependence. Application of Lindemann theory yielded an Arrhenius expression of k(T) = 3.3 x 10-32exp(-992/T) cm6 molecule-1 s-1 for the low pressure limit and k(T) = 8.47 x 10-14exp(-468/T) cm3 molecule-1 s-1 for the high pressure limit at temperatures between 289 and 842 K. The reaction is unusual as it possesses a positive activation energy at low temperature, yet at higher temperatures the activation energy is negative, illustrating a reaction barrier.

Grantor dc:publisher

University of North Texas

Year dc:date

2003

Author dc:creator

• Naidoo, Jacinth

Contributors dc:contributor

• Marshall, Paul, 1960-
• Wilson, Angela K.

• Sulfur dioxide.
• Flash photolysis.
• pressure dependence
• resonance fluorescence and flash photolysis
• Lindemann theory
• absorption cross-section
• falloff

Statement dc:rights

• Public
• Copyright
• Naidoo, Jacinth
• Copyright is held by the author, unless otherwise noted. All rights reserved.

Language dc:language

English

Identifier

oclc: 54453366
https://digital.library.unt.edu/ark:/67531/metadc4403/
ark: ark:/67531/metadc4403

OAI identifier oai:identifier

info:ark/67531/metadc4403