Effect of Pressure on Electron-Phonon Coupling Constants of All-Trans-β-Carotene
SUN Mei-jiao1,2, WANG Kai1, XU Sheng-nan2, QU Guan-nan2, LI Shuo2, SUN Cheng-lin2, ZHOU Mi2*, LI Zuo-wei2
1. State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China 2. College of Physics, Jilin University, Changchun 130012, China
Abstract：The present paper cited that R.Tubino and other people introduced a kind of electron-phonon coupling constants with dimension, which can establish the relation with the Huang-Rhys factor and calculate the electron-phonon coupling constants of every C—C bond vibration mode. There are many reports about the visible absorption and Raman spectra of all-trans-β-carotene with pressure. But the study about the Raman scattering cross section and the Huang-Rhys factor with pressure have not been reported now. Visible absorption and Raman spectra of all-trans-β-carotene were measured in carbon disulfide in the pressure range from 0.04 to 0.60 GPa. The results indicated that the visible absorption spectra of β-carotene in nonpolar solvent carbon disulfide are red-shifted with pressure increasing, but the frequency shifts towards higher frequencies in the Raman spectra, the Raman scattering cross section decreases, Huang-Rhys factor increases, and the electron-phonon coupling constants of CC bond vibration modes increase. The mechanism is that all-trans-β-carotene caused by compression and a decrease in the structurally ordered properties of the molecules leads to narrow energy gap of the π, shortens effective conjugation length, hinders delocalization of π-electron, decreases the Raman scattering cross section, and increases the Huang-Rhys factor and the electron-phonon coupling constants.
孙美娇1，2，王 凯1，徐胜楠2，曲冠男2，李 硕2，孙成林2，周 密2*，里佐威2 . 压强对β胡萝卜素分子的电子-声子耦合常数的影响 [J]. 光谱学与光谱分析, 2014, 34(05): 1302-1305.
SUN Mei-jiao1,2, WANG Kai1, XU Sheng-nan2, QU Guan-nan2, LI Shuo2, SUN Cheng-lin2, ZHOU Mi2*, LI Zuo-wei2 . Effect of Pressure on Electron-Phonon Coupling Constants of All-Trans-β-Carotene. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(05): 1302-1305.
[1] QU Guan-nan, LI Dong-fei, LI Zhan-long(曲冠男, 李东飞, 李占龙). Acta Physica Sinica(物理学报), 2010, 59: 3168. [2] Sugisaki M, Fujiwara M, Nair S V, et al. Phys. Rev. B., 2009, 80: 035118. [3] Liu W L, Zheng Z R, Zhu R B J. Phys. Chem. A, 2007, 111: 10044. [4] Paraschuk D Yu, Arnautov S A, Shchegolikhin A N, et al. JETP Lett., 1996, 64: 658. [5] Tubino R, Dorsinville R, Lam W, et al. Phys. Rev. B, 1984, 30: 6601. [6] Aleksandr E, Arvi F. Diff. Def. Forum.，2002, 208-209: 135. [7] CUI Hai-ning(崔海宁). Theory of the Thermodynamics System(热力学系统理论). Changchun: Jilin University Press(长春：吉林大学出版社), 2009. [8] Henderson B, Imbusch G F. Optical Spectroscopy of Inorganic Solids. Clarendon, Oxford University Press, 1989. [9] Peeters E, Ramos A M, Meskors S C J, et al. J. Chem. Phys., 2000, 112: 9445. [10] Hagler T W, Pakbaz K, Voss K F, et al. Phys. Rev. B, 1991, 44: 8652. [11] Biswas N, Umapathy S. Appl. Spectrosc., 1998, 52: 477. [12] Dudik J M, Johndon C R, Asher S A. J. Chem. Phys., 1985, 82: 1732. [13] Vardeny Z, Ehrenfreund E, Brafman O, et al. Phys. Rev. Lett., 1983, 24: 2326. [14] Koyama Y, Kuki M, Anderson P O, et al. Photochemistry and Photobiology, 1996, 63: 243. [15] Hoskins L C. J. Chem. Phys., 1980, 72: 4487.
