During this monograph we describe an enormous and comparatively new classification of phenomena within the box of high-resolution atomic spectroscopy: the interference results occur within the angular distribution and polarization of spontaneous radiation and absorption by way of atoms. even though the quantum-theoretical descrip tion of those interference results is sort of refined, it seems - as so usually in quantum mechanics - uncomplicated classical or semi-classical description deals a lot perception and will even clarify quantitative positive aspects. during this presentation, despite the fact that, we try to offer the complete tale. starting with the easy semi classical description, we then current the quantum-mechanical research in line with the density-matrix formalism and the statistical tensor. the remainder chapters talk about experimental observations and knowledge research. an outstanding number of results have now been saw and will be used to procure hugely accu price information regarding hyperfine constitution, atomic constants, interplay con stants, and so forth. The authors have assumed just a simple wisdom of quantum mechanics and electromagnetism, therefore making the publication available to these starting a graduate reports software. it's also aimed toward working towards spectroscopists and all researchers for whom atomic spectroscopy is a crucial instrument - for those readers it is going to expectantly provide a few new suggestions and ideas for furthering their study. February 1993 E. B. Alexandrov M. P. Chaika G. I. Khvostenko Contents 1. creation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . eight 2. Classical Description of Interference Phenomena in Radiation 2. 1 The Classical Oscillator version of Atomic Emission . .
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