Accession Number : ADA135971

Title :   Atomic and Molecular Gas Phase Spectrometry.

Descriptive Note : Final scientific rept. 1 Oct 79-30 Sep 83,


Personal Author(s) : Winefordner,J D

PDF Url : ADA135971

Report Date : 30 Sep 1983

Pagination or Media Count : 53

Abstract : The major goals of this research have been to develop diagnostical spectroscopic methods for measuring spatial/temporal temperatures of combustion flames and plasmas and to develop sensitive, selective, precise, reliable, rapid spectrometric methods of trace analysis of elements present in jet engine lubricating oils, matellurgical samples, biological materials, and automobile and other engine exhausts. The diagnostical approaches have been based upon the measurement of pulsed laser excited fluorescence of seeds, such as In, T1, Pb, etc., introduced into the flames, plasmas, or hot gases or in the case of flames, the measurement of natural flame species as OH. Because of the excellent fluorescence signal to noise ratios, it has been possible to measure temperatures of combustion flames for volumes smaller than 1 cu mm and for single laser pulses of a few nanoseconds. The technique with the most promise for use in combustion flames and in reactors is based upon thermally assisted fluorescence of an externally introduced seed as T1 and In or of an internal species as OH. By exciting the species with a dye laser and measuring the fluorescence from energy levels thermally excited form the laser excited state, the flame (plasma) temperature can be readily measured ( + or - 10 C) for a volume 1 mm 3 and for a single laser pulse.

Descriptors :   *Flames, *Plasmas(Physics), *Spectrometry, Temperature measuring instruments, Exhaust gases, Diagnostic equipment, Gas analysis, Laser induced fluorescence, Atomic spectroscopy, Molecular spectroscopy

Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE