Experimental and Theoretical Studies of Nuclear Generation of Ozone and Its Photolysis Into Singlet Delta Oxygen

A series of measurements of O(,3) yield in nuclear induced O(,2) and O(,2)-SF(,6) discharges are reported. The discharges were created by bombardment with energetic particles from the ('10)B(n,(alpha))('7)Li reaction. Continuous irradiation at dose rates of 10('15) - 10('17) eV(.)cm('-3)(.)s('-1) and pulsed irradiation ((TURN)10 ms FWHM) at a peak dose rate of (TURN)10('20) eV(.)cm('-3)(.)s('-1) were conducted. At the lower dose rates, SF(,6) addition generally increased the ozone yield due to the slowing of ozone destruction by negative oxygen and ozone ions. In contrast, at the high dose rates, SF(,6) addition decreased the observed ozone concentration due to its suppression of atomic oxygen formation by ion-ion recombination. A numerical model was developed and applied to experimental conditions. The steady-state ozone concentration was found to be limited by the reaction O(,3)('-) + O(,3) (--->) 2 O(,2) + O(,2)('-) for which a rate coefficient of (TURN)1 x 10('-12) cm('3)(.)s('-1) gives a good fit to the experimental data. A simplified analytical model of steady-state conditions was used to predict model sensitivity to various parameters. In addition to dose rate effects, pressure and temperature effects on ozone production were discussed.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Electrical Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2014

Author dc:creator

• Elsayed-Ali, Hani Elsayed

• Engineering, Electronics and Electrical

Identifier

(UMI)AAI8521758

OAI record oai:identifier

https://www.ideals.illinois.edu/oai-pmh?verb=GetRecord&metadataPrefix=etdms&identifier=oai%3Awww.ideals.illinois.edu%3A2142%2F69306