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The -carotene is a short chain polyene molecule containing nine -electron conjugated double-bonds. Because of its special molecular structure, -carotene has been used widely in many fields, including functional materials, optoelectronic devices and biological applications of light collection, light protection, anti-cancer, etc. Recently, new applications of -carotene in generation and detection of terahertz (THz) wave have also attracted great attention. In this work, all-trans -carotene films are prepared by spray coating, and the THz spectra in a wavenumber range of 30-400 cm-1 (a frequency range of 0.9-12 THz) of the as-prepared products are experimentally measured at room temperature by Fourier transform infrared spectroscopy. For comparison, the THz spectra in 0.5-3.0 THz are also characterized at the same temperature by THz time-domain spectroscopy. Based on these measurements, the fingerprint peaks of all-trans -carotene in the THz region are experimentally identified to be located at 54 cm-1 (1.62 THz), 57 cm-1 (1.71 THz), 64 cm-1 (1.91 THz), 77 cm-1 (2.32 THz), 90 cm-1 (2.69 THz), 98 cm-1 (2.95 THz), 115 cm-1 (3.45 THz), 124 cm-1 (3.72 THz), 134 cm-1 (4.02 THz), 170 cm-1 (5.11 THz), 247 cm-1 (7.42 THz), and 279 cm-1 (8.38 THz), respectively. It is worth noting that the recent results about the THz spectra of palm leaves are thus verified. Particularly, the B3 LYP method of density functional theory is further utilized in this work to theoretically simulate the THz spectra of all-trans -carotene molecule. It is revealed that the theoretical simulation results accord well with those experimentally measured data. In addition, we also find that the absorption peaks are caused by the torsion, deformation and rocking vibration of the molecules. Accordingly, the vibrational modes of the measured THz characteristic peaks at 148 cm-1 (4.44 THz), 132 cm-1 (3.96 THz), 115 cm-1 (3.45 THz), 76 cm-1 (2.28 THz) and 52 cm-1 (1.56 THz) are theoretically assigned, which provides a reference to explain the formation mechanism of the THz spectra. The valuable results presented in this work will be helpful for promoting the studies of the THz spectral features and response mechanisms of the organics.
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[20] Shen Y C, Upadhya P C, Linfield E H, Davies A G 2003 Appl. Phys. Lett. 82 2350
[21] Ma J L, Xu K J, Li Z, Jin B B, Fu R, Zhang C H, Ji Z M, Zhang C, Chen Z X, Chen J, Wu P H 2009 Acta Phys. Sin. 58 6101 (in Chinese)[马金龙, 徐开俊, 李哲, 金飚兵, 傅荣, 张彩虹, 吉争鸣, 张仓, 陈兆旭, 陈健, 吴培亨2009 58 6101]
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[1] Ferguson B, Zhang X C 2002 Nat. Mater. 1 26
[2] Shen Y C, Upadhya P C, Linfield E H, Davies A G 2004 Vib. Spectrosc. 35 111
[3] Markelz A G, Roitberg A, Heilweil E J 2000 Chem. Phys. Lett. 320 42
[4] Globus T R, Woolard D L, Khromova T, Crowe T W, Bykhovskaia M, Gelmont B L, Hesler J, Samuels A C 2003 J. Biol. Phys. 29 89
[5] Taday P F, Bradley I V, Arnone D D 2003 J. Biol. Phys. 29 109
[6] Guo H, He M, Huang R, Qi W, Guo W H, Su R X, He Z M 2014 RSC Adv. 4 57945
[7] Schlcker S, Szeghalmi A, Schmitt M, Popp J, Kiefer W 2003 J. Raman Spectrosc. 34 413
[8] Ziegler R G 1991 Am. J. Clin. Nutr. 53 251S
[9] Sugisaki M, Fujiwara M, Nair S V, Ruda H E, Cogdell R J, Hashimoto H 2009 Phys. Rev. B 80 035118
[10] Ostroumov E E, Muller M G, Reus M, Holzwarth A R 2011 J. Phys. Chem. A 115 3698
[11] Yanagi K, Miyata Y, Kataura H 2006 Adv. Mater. 18 437
[12] Zuo J, Zhang L L, Yu F, Zhang Z W, Zhang C L 2010 Proc. SPIE Beijing, China, October 18-22, 2010 p785439
[13] Zhang L W, Zuo J, Zhang C L 2014 Spectrosc. Spect. Anal. 34 405 (in Chinese)[张磊巍, 左剑, 张存林2014光谱学与光谱分析34 405]
[14] Liu Y K, Liu Y T, Xu X D, Yan W, Ma M, Zhu H Z, Ma C Q, Zou R J, Din L, Luo M J 2015 Acta Phys. Sin. 64 068701 (in Chinese)[刘一客, 刘禹彤, 许向东, 闫微, 马淼, 朱宏钊, 马春前, 邹瑞娇, 丁廉, 罗梦佳2015 64 068701]
[15] Hu Y Q, Chen Y J, Li H H, Wang H S 2012 Spectrosc. Spect. Anal. 32 339 (in Chinese)[胡燕琴, 陈玉静, 李慧华, 王海水2012光谱学与光谱分析32 339]
[16] Naftaly M, Miles R E 2007 P. IEEE 95 1658
[17] Zhang T J, Cai J H, Zhou Z K 2008 Spectrosc. Spect. Anal. 28 721 (in Chinese)[张同军, 蔡晋辉, 周泽魁2008光谱学与光谱分析28 721]
[18] Mickan S P, Lee K S, Lu T M, Munch J, Abbott D, Zhang X C 2002 Microelectron. J. 12 1033
[19] Li Y B, Zheng Y Y, Wang W N 2007 J. Capital Normal Univ.:Nat. Sci. Ed. 28 39 (in Chinese)[李元波, 郑盈盈, 王卫宁2007首都师范大学学报:自然科学版28 39]
[20] Shen Y C, Upadhya P C, Linfield E H, Davies A G 2003 Appl. Phys. Lett. 82 2350
[21] Ma J L, Xu K J, Li Z, Jin B B, Fu R, Zhang C H, Ji Z M, Zhang C, Chen Z X, Chen J, Wu P H 2009 Acta Phys. Sin. 58 6101 (in Chinese)[马金龙, 徐开俊, 李哲, 金飚兵, 傅荣, 张彩虹, 吉争鸣, 张仓, 陈兆旭, 陈健, 吴培亨2009 58 6101]
[22] Yu B, Zeng F, Yang Y, Xing Q, Chechin A, Xin X, Zeylikovich I, Alfano R R 2004 Biophys. J. 86 164
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