Time-resolved resonance fluorescence study of electronically excited iodine atoms. Quenching of I(52P½) by C2D4, C3D6 and CD3I

Abstract

An improved system for the kinetic study of electronically excited iodine atoms I(5²P_½), by time-resolved atomic resonance fluorescence, is described. Rate coefficients for quenching of I(5²P_½) by CD₃I, C₂D₄ and C₃D₆ have been determined as k/cm³ molecule^–1 s^–1=(4.2 ± 0.2)× 10^–15, (3.1 ± 0.2)× 10^–15 and (4.6 ± 0.4)× 10^–15 respectively. These values are more than an order of magnitude lower than those for the corresponding hydrogen-containing species. For CD₃I, satisfactory agreement with the atomic resonance absorption technique is noted. Data for C₂D₄, C₃D₆ and undeuterated olefins are discussed in terms of the formation of an intermediate complex.