A Study On Molecular Spectra Of Aicohol-Water Mixtures And The Diffusion Theory With Photon Density Wave

The absorption and fluorescent spectra of four monohydric alcohol fully dissolved in water, and its characteristic are fully studied in theory and experiment. The solution of diffusion equation and numerical value simulation on photon density wave theory are also systematically studied in this paper.From the experimental outcomes of the UV-light absorption spectra and the fluorescent spectra of methanol, we find that methanol molecules can absorb the exciting light with a wavelength less than 260nm, and the fluorescent intensity has a regularity change with the concentration change of methanol. Thus the absorbing-emitting mechanism of methanol molecule is discussed and analysized.The UV-light absorption spectra and the fluorescent spectra of ethanol are studied, which are especially compared to the methanol solution. Based on the obtained results, a difference of 15nm in longest absorption wavelengths and a difference of 33nm in center fluorescent wavelength can be used precisely to distinct methanol and ethanol. The spectra difference of two solutions can be explained reasonably on the structural theory of molecule. Furthermore, a new method to distinguish methanol and ethanol is put forward by the spectra characteristics in longest absorption wavelengths and center fluorescent wavelength.Yanghe original alcohol with typical flavor of Jiangsu was chosen in the study of its spectroscopy, just because alcohol is the most quantitive production and ethanol be applied to foodstuff industry. Three brands of stronger fragrant flavor alcohol which come from different regions were compared in study of spectroscopy. Many useful results were obtained that can be used to tell the age of the alcoholic and wine and identify the different brands.The UV-light absorption spectra and the fluorescent spectra of propanol and isopropanol are also compared in study. According to the results of our researches, propanol and isopropanol could be clearly distinguished by absorption spectra and fluorescent spectra. In this paper, the reasons of difference spectra of two liquids are also explained. Moreover, the fluorescent spectra of the four kinds of different alcohol were compared and the results were discussed. The solution of diffusion equation and the numerical value simulation on photon density wave theory are studied. We consider the general situation in which a amplitude of the point light source may be modulated at frequency Ω. The solutions of diffusion equation in infinite, semi-infinite and finite cube space with photon density wave were researched based on the need of experimental model. The analytic solution of Green-function is occurred under the boundary conditions, and the relationship betweenthe flux J_n and absorption factor △μ_a was worked out by calculation. By use of three...