Accession Number : ADA115534

Title :   Laser Induced Fluorescence of Barium Evaporating from a Dispenser Cathode.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s) : Zemyan,Stephen Michael

PDF Url : ADA115534

Report Date : Mar 1982

Pagination or Media Count : 66

Abstract : A continuous wave dye laser is used to induce resonance fluorescence in Ba atoms evaporating from a thermionic dispenser cathode. The laser is tuned to the 553.5 microns Ba I line by making use of the optogalvanic effect in a hollow cathode discharge tube. Photon counting equipment is used to measure the Ba fluorescent intensity as a function of cathode temperature and laser power. Ba concentrations and evaporation rates as functions of temperature are derived from the fluorescent intensity. Laser induced fluorescence is established as a technique for examining various species evaporating from cathodes. The technique can be used in attempts to determine cathode failure mechanisms. (Author)

Descriptors :   *Cathodes(Electron tubes), *Laser induced fluorescence, *Continuous wave lasers, *Barium, Evaporation, Intensity, Failure(Mechanics), Thermionic emission, Photons, Atoms, Counting methods, Theses

Subject Categories : Inorganic Chemistry
      Electrical and Electronic Equipment
      Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE