University of Illinois Urbana-Champaign

Iodine-Monofluoride (If) Emission Spectrum and Formation Kinetics in Electron Beam Produced Plasmas

Hutchison, Sheldon Butt

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Description

Title
Iodine-Monofluoride (If) Emission Spectrum and Formation Kinetics in Electron Beam Produced Plasmas
Author(s)
Hutchison, Sheldon Butt
Issue Date
1980
Department of Study
Electrical Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Language
eng
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.
Graduation Semester
1980
Type of Resource
text
Permalink
http://hdl.handle.net/2142/66240

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