New Investigation Directions in Emission Optical Spectral Analysis of Atmorsphere Plasma Arc

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Hello, I am a student in plasma physics, I am going to learn some
knowledge about atmosphere plasma arc with emission optical spectrum,
the plasma arc is mainly used in welding. It is really a difficult work
for a greenhorn to collet the information in such a broad area, and I
know that the directionds in this area will help me quckly have a basic
understanding of the subject and collect information easily and
effectively, so I wish you give me some sugestions or tips about this
topic.