English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

The UV absorption cross-sections of the Criegee intermediate CH 2 OO, and kinetics of the CH 2 OO self-reaction and the reaction of CH 2 OO with I are reported as a function of pressure at 298 K. Measurements were made using pulsed laser flash photolysis of CH 2 I 2 /O 2 /N 2 gas mixtures coupled with time-resolved broadband UV absorption spectroscopy at pressures between 6 and 300 Torr. Results give a peak absorption cross-section of (1.37 ± 0.29) × 10 -17 cm 2 at ∼340 nm and a rate coefficient for the CH 2 OO self-reaction of (8.0 ± 1.1) × 10 -11 cm 3 s -1 , with no significant pressure dependence of the absorption cross-sections or the self-reaction kinetics over the range investigated. The rate coefficient for the reaction between CH 2 OO and I demonstrates pressure dependence over the range investigated, with a Lindemann fit giving k 0 = (4.4 ± 1.0) × 10 -29 cm 6 s -1 and k ∞ = (6.7 ± 0.6) × 10 -11 cm 3 s -1 . The origins of IO in the system have been investigated, the implications of which are discussed.

physical chemistry chemical physics

CH2OO Criegee intermediate UV absorption cross-sections and kinetics of CH2OO + CH2OO and CH2OO + I as a function of pressure