Quenching of I(²P_1/2) by O₃

Abstract

The quenching of the spin‐orbit excited state of iodine atoms (I*) by ozone was measured in a flash photolysis system monitoring the resonant absorption of I* at 206.2 nm. A quenching rate constant of (1.1 ± 0.1) · 10−11 cm3 s−1 was obtained at 300 K. This high value implies a reactive channel leading to the production of IO + O2. Indirect experimental observations confirm the presence of the latter species after the flash. A comparison of the present results with the reaction involving the fundamental state of atomic iodine is made. A strong spin‐orbit effect is found. The rate constant for the quenching by O2 was also measured yielding a value of (2.7 ± 0.3) · 10−11 cm3 s−1.

Deactivation of I(2P1/2) by CH3Cl, CH2Cl2, CHCl3, CCl3F, and CCl4

“…Thus, quenching efficiencies have been measured for many different colliders. Experimental approaches have ranged for direct state-to-state E-v energy transfer studies [5,6] to the measurement of bulk overall quenching rate constants [7,8]. Also of interest is the study of a series of related (or a "family of") compounds in which their similarities can lead to [3,5,6,11 -13].…”