Publication Date:
2007-10-25
Description:
The atmospheric chemistry of sulphuryl fluoride, SO2F2, was investigated in a series of laboratory studies. A competitive rate method, using pulsed laser photolysis (PLP) to generate O(1D) coupled to detection of OH by laser induced fluorescence (LIF), was used to determine the overall rate coefficient for the reaction O(1D)+SO2F2 → products (R1) of k1 (220–300 K)=(1.3±0.2)×10−10 cm³ molecule−1 s−1. Monitoring the O(³P) product (R1a) enabled the contribution (α) of the physical quenching process (in which SO2F2 is not consumed) to be determined as α1 (225–296 K)=(0.55±0.04). Separate, relative rate measurements at 298 K provided a rate coefficient for reactive loss of O(1D), k1b, of (5.8±0.8)×10−11 cm³ molecule−1 s−1 in good agreement with the value calculated from (1−α)×k1=(5.9±1.0)×10−11 cm³ molecule−1 s−1. Upper limits for the rate coefficients for reaction of SO2F2 with OH (R2, using PLP-LIF), and with O3 (R3, static reactor) were determined as k2 (294 K)
Electronic ISSN:
1680-7375
Topics:
Geosciences
