Kinetic investigation of electronically excited oxygen atoms, O(21D2), by time-resolved attenuation of atomic resonance radiation in the vacuum ultra-violet. Part 2.—Collisional quenching by the atmospheric gases N2, O2, CO, CO2, H2O and O3.

Abstract

The electronically excited oxygen atom. O(2¹D₂), has been studied in absorption by time-resolved attenuation of the atomic resonance radiation at λ= 115.2 nm (3¹D^o₂→ 2¹D₂). Absolute quenching coefficients for the removal of O(2¹D₂) by the gases N₂, O₂, CO, CO₂, H₂O and O₃ are reported.

These collisional processes are discussed within the context of the spin and orbital symmetry of reactants and products. A detailed comparison with previous laboratory and atmospheric measurements of these processes is presented.