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Determination of the negative ion number density of O 2 and Oin a DC discharge of oxygen plasma was made employing Langmuir probe in conjunction with eclipse laser photodetachment technique. The temporal evolution of the extra electrons resulting from the photodetachment of O 2 and Owere used to evaluate the negative ion number density. The ratio of O 2 number density to Ovaried from 0.03 to 0.22. Number density of both O 2 and Oincreased with increasing power and decreased as the pressure was increased. Electron number density was evaluated from the electron energy distribution function (EEDF) using the I-V recorded characteristic curves. Electron temperature between 2 and 2.7 eV were obtained. Influence of the a O 2 1 g D ( ) metastable state is discussed.

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