Rate Constants for Quenching the A(Prime) 2A2 State of SO2(+) by Atmospheric Gases
Abstract
In the course of obtaining the ion photodissociation spectrum of SO2+, which we have recently reported in this Journal, we have observed that the measured cross sections for photodissociation in the visible region were dependent upon the pressure of SO2 used in the ion source. Since our previous work using the same ion source had shown no pressure effect on the photodissociation cross sections of N2O+, this observation was unexpected. At source pressures in the 0.01 to 0.10 Torr range (approx. 30 x the pressure used in gathering our previous SO2+ data) a significant effect on the photodissociation spectrum of Ar2+ had previously been observed in the same ion source, however. This effect was interpreted in terms of collisional deactivation of vibrationally excited Ar2+ with a rate constant approx. 12% of Langevin. Thus, the pressure effect seen for SO2+ indicated some deactivation process occurring at a rate exceeding the theoretical upper limit for ion-molecular reactions. It therefore seemed important to make a systematic study of the processes involved and their precise rate constants. Sulfur oxides, Reprints.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1988
- Accession Number
- ADA196717
Entities
People
- Fred Dale
- John F. Paulson
- Timothy F. Thomas