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CROSS SECTIONS AND ELECTRON AFFINITY FOR O(-) IONS FROM 02, CO, CO2 BY ELECTRON IMPACT
WESTINGHOUSE ELECTRIC CORP PITTSBURGH PA
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Cross sections for the formation of O- from O2, CO, and CO2 were measured using an electron beam experiment in which an attempt is made to eliminate kinetic energy and angular discrimination by collecting most of the positive and negative ions produced in the tube. The cross sections are independent of electron current, pressure, and magnetic field. The values of these cross sections at their peak are 1.3 x 110 to the 18th power sq cm at 6.7 ev in O2, 1.6 x 110 to the 19th power sq cm at 10.1 ev in CO, and 4.5 x 110 to the 19th power sq cm at 8.2 ev in CO2. O- from CO2 exhibits a second smaller peak at 4.2 ev with a cross section of 1.5 x 110 to the 19th power sq cm. Kinetic energy measurements on the O- ion from O2 and CO2 are not compatible with the value for the electron affinity 1.465 ev obtained from photodetachment experiments but yield an electron affinity of 2.0 0.1 ev and so suggest the existence of excited states of O-. Author
APPROVED FOR PUBLIC RELEASE