Investigation of concept of efficient short wavelength laser. Quarterly progress report, 1 April 1977--30 June 1977
An experiment was designed to study the wavelength-selected photolysis of gaseous, covalent azides. The apparatus for these studies is described. The azides are to be photolyzed by light from a doubled dye laser, and the photolysis fragments probed by laser-induced fluorescence (LIF) or by the observation of photon emission. Kinetics of the photolysis fragments may be studied by precisely controlling the time between the pulses from the photolysis and probe lasers. In such a system we shall be able to determine the product yields from the photolysis, the kinetics of the electronically excited fragments, and the spectroscopy of the photolysis fragments. The latter measurement is accomplished by scanning the fragment fluorescence spectrum with a monochromator, or by scanning the probe laser over the absorption bands of the fragment molecules. The problems of scattered laser light and techniques to reduce them are discussed in detail. Calculations have been performed to simulate typical experimental conditions to be expected in studies on the photolysis of HN/sub 3/. Typical fragment densities are calculated along with the signals expected from the LIF diagnostic. Several experimental problems, such as fluorescence quenching and diffusion, are discussed in detail. It is concluded that the proposed experimental design will have sufficient sensitivity and flexibility to perform the experiments.
- Research Organization:
- Physical Sciences, Inc., Woburn, Mass. (USA)
- OSTI ID:
- 5052519
- Report Number(s):
- COO-4223-1; PSI-TR-98
- Country of Publication:
- United States
- Language:
- English
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