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Title:Iodine-Monofluoride (If) Emission Spectrum and Formation Kinetics in Electron Beam Produced Plasmas
Author(s):Hutchison, Sheldon Butt
Department / Program:Electrical Engineering
Discipline:Electrical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Engineering, Electronics and Electrical
Abstract:Electron beam excitation of argon/CF(,3)I/NF(,3) gas mixtures produces intense blue-green fluorescence attributed to the heteronuclear interhalogen iodine-monofluoride (IF). Analysis of the observed IF emission spectrum has shown that it is most likely due to E (--->) A('3)(PI)(,1) transitions of this molecule. Fluorescence decay measurements indicate that the I('*)(('4)P) species is the IF('*)(E) precursor, and that the observed fluorescence decay rates are controlled by deactivation of this excited iodine species. Collisional deactivation rate coefficients of I('*)(('4)P) by argon, xenon, CF(,3)I, NF(,3), and UF(,6) were measured and are reported.
Mathematical modelling of the IF('*) fluorescence pulse suggests that the effective lifetime of the I('*)(('4)P) species increases with time during the pulse due to radiative trapping of atomic iodine emission. This model also indicates that radiative decay of the Ar(,2)('*) (('1)(SUMM)(,u)('+)) species is directly responsible for I('*)(('4)P) production.
Discharge pumped IF('*) laser experiments are also briefly described. Lasing in this system has been achieved on a number of lines between approximately 480 nm and 496 nm for helium/CF(,3)I/NF(,3) gas mixtures.
Issue Date:1980
Description:76 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1980.
Other Identifier(s):(UMI)AAI8108551
Date Available in IDEALS:2014-12-12
Date Deposited:1980

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