2. Photon Interactions with Particles

摘要: Publisher Summary This chapter discusses the photon interactions with particles. The transition probabilities for allowed and forbidden lines are discussed. intensity of a spectral line is function environmental factors that govern initial state population as well atomic constant characteristic specific line, namely, its probability. In an analogous fashion, stimulated emission absorption introduced, but frequency these two photoprocesses depends also on density radiation field. three related through set constants. Some values field strengths required barrier penetration given, some experimental techniques have been used described. common methods determination temperature particle densities in shock tubes thermal arcs