Optical Diagnostics of Diamond CVD in DC Arc-Jets

摘要

The Principle Investigator, visited Dr. Richard Woodin of Norton Diamond Films atthe Technion facility in Irvine, California on October 26, 1992. Norton's optical diagnostics laboratory was toured and the difficulties of laser-based diagnostics in an industrial environment were considered in detail. During this visit, Norton's plans to observe plasma emission were discussed, and the influence of the excitation mechanism which produces the molecular excited states was elucidated. The molecular emission in a chemically reacting plasma can arise from three different excitation mechanisms: thermal emission, electron impact excitation, and chemiluminescent reaction. Each of these excitation mechanisms produces a distinctly different population distribution in the rotational and vibrational levels of the electronically excited state. Each of these mechanisms is briefly discussed here.