chamber various incidental processes may be performed on the reactive species such as heating or cooling the gas stream to a desired temperature prior to its contacting the fiber this incidental processing might in some cases change the chemical composition of the reactive species or change the relative proportions of the various gaseous species as one example of this embodiment of the invention the plasma may be configured to create a large concentration of ozone which may then be heated to decompose the ozone into atomic oxygen before introducing it into the treatment chamber thus a conduit provided to carry the plasma derived species into the processing chamber may contain such well known structures as heaters heat exchangers radiative cooling fins and the like as are familiar in the art those skilled in the art of plasma devices and processes will appreciate that control of the plasma device may involve any or all of the following parameters voltage frequency current power and waveform density pulsing or duty cycle the selection of a complete process for a particular carbon fiber product and a particular application will involve the application of routine engineering analysis to select and optimize the following system parameters plasma device and geometry gas mixture and flow rates gas pressure temperature processing residence time and composition of item undergoing processing it will be further understood that the description of exemplary.