Inlfuence Of Temperature On The Electron-phonon Coupling Constant Of All-trans-β-carotene

To our knowledge, The Linear polymer molecules, with several π—π*conjugated double bonds, are highly interesting subjects due to theirpotential photoelectric applications, as a result, It has been praisedby domestic and foreign research department over the years, and manyresearchers have studied the structure and properties of linearmolecular.Two parts in detail of this paper were shown as followed through beingmeasured temperature-dependent Visible absorption and Raman spectra：1. Resonance Raman spectroscopy is the most useful tool in studyingLinear polymer molecules. Linear polymer molecule is an importantphotoelectric material, which has the functions of light collection,optical protection，cancer prevention and anti-cancer. Also, it is anideal molecule in physics and chemistry theory research. Resonance Ramanspectroscopy is the most useful tool in studying linear polymer molecules.This paper summarizes the characteristics of the resonance Raman spectraof the linear polymer molecule, and its relations with the molecularstructure, including: electronic spectra(Ultraviolet-visible absorptionspectrum), Raman spectra characteristics and its relations with externalfield; Modulation relation between the electron energy gap and CC atomvibration; Several experimental results ware obtained: The UV-visibleabsorption spectra are blue-shifted with the increasing temperature,decreasing solvent density and increasing solution concentration,because the linear polymer molecule has low structured order, reducingπ electron energy gap; Unobvious extended π electronic delocalization, small effective conjugation length, small intensity of the Raman activity,As a result Raman spectrum are blue-shifted, small scattering crosssection.“Amplitude modes” is the ideal theory models to study thelinear polymer molecule.2. The process of Resonance Raman is done through the Electron-phonon coupling constant, at the same time, electron-phonon coupling constant is an important physical parameter characterization of this process. Lots of quantities can be characterized, such as Effective conjugation length, the π-electron delocalization range and Raman scattering cross section and so on. However, Electron-phonon coupling constant need multiple wavelength excitation and more complex calculation,and it affects the research and application at the same time. This paper introduced several simplified calculations of electron-phonon coupling constant of all-trans-β-carotene temperature range through measure temperature-dependent Visible absorption and Raman spectra. Theresults still can well characterized the visible absorption and Raman spectra...