An Experimental Study On The Raman Of Some Organic Molecule

When molecule is irradiated with light, there are some scattered lightwith different frequencies from the inserting light according to the theoryof the interaction between the photons and molecule. This scattering withnew frequency is called Raman scattering and the spectra produced bythese scattering is called Raman spectra. By detecting Raman shifting, theintensity and the polarization of Raman scattered light, we can study themolecular vibrational and rotational energy level, identify some atomicgroup of molecule partly. So Raman spectroscopy technique plays animportant role in some fundamental application fields such as moleculespectroscopy, analytical chemistry etc. The application of laser asirradiation light makes it develop into a new technique- laser Ramantechnique, which is extensively applied in many research fields such asmolecular identification, molecular structure, organic and inorganicanalytical chemistry, biochemistry, petrochemical industry, and so on. There are three chapters in this paper. The main contents are listed asfollowing. In the first chapter, the background, its development andapplied fields are presented briefly. In chapter two, the basic principles ofthe Raman spectroscopy technique are introduced. In chapter three, theRaman spectroscopy of some organic compound is investigated. Themain contents are: (1) The vibrational Raman spectra of acetone,isopropyl alcohol, ethyl alcohol, ethylene glycol, toluene, ether,N-butanol and formamide are determined in the experiment. (2) By 2comparing our work to previous work and considering the selection rulesof Raman spectroscopy, the assignment of the spectral lines and theircorrespondent vibrational modes are presented. The main results are: (1)In 200~3500 cm?1 Raman shifting range, acetone has thirteen Ramanspectral lines, isopropyl alcohol has seven Raman spectral lines, ethylalcohol has seven Raman spectral lines, ethylene glycol has twelveRaman spectral lines, toluene has twelve Raman spectral lines, ether hasfourteen Raman spectral lines, N- butanol has fourteen Raman spectrallines, formamide has eight Raman spectral lines. (2) The Raman spectralline 289 cm?1 and 285 cm?1 in isopropyl alcohol and ethyl alcoholrespectively are firstly detected.