Excited Atomic Bromine Energy Transfer and Quenching Mechanisms

Author

Ray O. Johnson

Date of Award

8-1993

Document Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Department of Engineering Physics

Second Advisor

Won B. Roh, PhD

Abstract

Pulsed and steady-state photolysis experiments have been conducted to determine the rate coefficients for collisional deactivation of the spin-orbit excited state of atomic bromine, Br(²p_1/2). Pulsed lifetime studies for quenching by Br₂ and CO₂, established absolute rate coefficients at room temperature of k_Br2 = 1.2 ± 0.1 x 10^-12 and k_CO2 = 1.5 ± 0.2 x 10^-11 cm³/molecule-s. Steady-state photolysis methods were used to determine the quenching rates for the rare gases, N₂, 0₂, H₂, D₂, NO, NO₂, N₂O, SF₆, CF₄, CH₄, CO, C0₂, COS, S0₂, H₂S, HBr, HCl, and HI relative to that for Br₂. Quenching rate temperature dependence was examined for Br₂, C0₂, N₂0, HCl, COS, NO, and N0₂ for temperatures from 300 to 420 K. Diffusion and three body effects were examined in order to determine the slowest relative quenching rate measurable by this experimental technique.

AFIT Designator

AFIT-DS-ENP-93-05

DTIC Accession Number

ADA270672

Recommended Citation

Johnson, Ray O., "Excited Atomic Bromine Energy Transfer and Quenching Mechanisms" (1993). Theses and Dissertations. 6884.
https://scholar.afit.edu/etd/6884