AVS 49th International Symposium
    Surface Science Tuesday Sessions
       Session SS2-TuA

Paper SS2-TuA8
Variable-Temperature Studies of Sulfur Dioxide Reactions with Carbon Clusters

Tuesday, November 5, 2002, 4:20 pm, Room C-110

Session: Atmospheric Surface Chemistry
Presenter: A.J. Leavitt, State University of West Georgia
Authors: W.T. Wallace, Georgia Institute of Technology
A.J. Leavitt, State University of West Georgia
M.G. Arredondo, Georgia Institute of Technology
D. Doby, State University of West Georgia
R.L. Whetten, Georgia Institute of Technology
Correspondent: Click to Email
The variable-temperature reactions of SO@sub2@ with thermalized carbon cluster anions, C@subN@@super-@, are reported. Carbon clusters were produced via laser vaporization of a graphite rod and exposed to a dilute SO@sub2@:He mixture in a pulsed variable-temperature flow tube reactor (FTR). The products of these reactions were detected using time-of-flight mass spectrometry. A series of reactions were monitored at FTR temperatures of 96 @degree@C, 73 @degree@C, 55 @degree@C, 47 @degree@C, 38 @degree@C, and 24 @degree@C. At all temperatures, the products C@subN@O@super-@ and C@subN@O@sub2@@super-@ were detected corresponding to the depletion of the parent C@subN@@super-@ concentration in the mass balance for selected values of N = 8 to 40. At each increasing temperature, the reaction was driven closer to completion when compared to C@subN@@super-@:SO@sub2@ reactivity at room temperature. These studies probe the reactive nature of atmospheric soot with SO@subx@ that are linked to respiratory problems.