Quantum chromo dynamics

The weak interaction and quantum chromo-dynamics (QCD) play no role at the present level of accuracy. 

Elementary particles come in only two kinds quarks and leptons. There are only six quarks and six leptons, see Table 10.2. The leptons are the electron, e, the muon, fi, and the tauon (tau particle), t, and their respective neutrinos. The quarks and leptons are grouped together in three families (or generations) of two quarks and two leptons each. This makes 12 elementary building blocks, or 24 if one counts their anti particles Table 10.2 only refers to our matter (i.e. koino matter). The leptons and quarks all have different properties and names, sometimes also referred to as colors. The physical theory relating these particles to each other is therefore named Quantum Chromo Dynamics (QCD). 

The applications of MC are diverse such as Nuclear reactor simulation. Quantum chromo dynamics. Radiation cancer therapy. Traffic flow. Stellar evolution. Econometrics, Dow Jones forecasting. Oil well exploration, VSLI design [122]... 

With all of these new tools, it is no wonder that there has been an explosion of papers on photochemical dynamics, so much so that in this review we shall limit ourselves to those papers that have appeared over the last three years. Earlier reviews cover the work before this time, and the papers that are cited also give references to the earlier work. The papers that are covered are further limited to those that measure and discuss the detailed quantum state distribution of one or more of the photochemical fragments. Those papers that are limited to final product analysis are discussed only if the results bear directly upon the dynamics of the photochemical process. The review is organized so that molecules with similar chromo-phore groups are all discussed at the same time. This emphasizes the similarities and differences between these molecules. The discussion of the molecular systems begins after a brief discussion of some of the newer experimental techniques. In this review any earlier reviews that cover that molecule are cited along with the later papers on the subject. 

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