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Atomic Oxygen Absorption Cell System.
Final rept. 15 Apr 70-15 Dec 71,
PHOTOCHEM INDUSTRIES INC FAIRFIELD N J
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An atomic oxygen absorption cell system has been developed for application in the measurement of absorption cross sections of atomic oxygen at wavelengths shorter than 910 A the first ionization threshold. The system is based on vacuum ultraviolet photodissociation of oxygen molecules via absorption of light in the Schumann-Runge continuum 1300 A to 1760 A. The necessary dissociative vacuum ultraviolet flux is supplied from a cylindrical, xenon, plasma source which surrounds a sapphire walled absorption cell. The pressure, annular thickness and length of the xenon plasma is variable. Analysis indicates that an oxygen atom concentration in excess of 90 can be achieved under steady operating conditions. The cell is constructed to be compatible with McPherson vacuum monochromators. Author
APPROVED FOR PUBLIC RELEASE