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What's the interest rate on this account? http://buy-levitra.in.net/ levitra generic  This photoluminescence is caused by the substitution of carbon atoms for nitrogen (nitrogen vacancies). Photons of laser light, from the second laser source, are absorbed by the defects, which excites electrons from a low energy level to a higher one. Once this occurs, the electrons then relax and release their own photons, a well-known process, called optical pumping.