Rao AM, Richter E, Bandow S, Chase B, Eklund PC, Williams KA, Fang S, Subbaswamy KR, Menon M, Thess A, Smalley RE, Dresselhaus G, Dresselhaus MS
A. M. Rao and P. C. Eklund, Department of Physics and Astronomy and Center for Applied Energy Research, University of Kentucky, Lexington, KY 40506-0055, USA. E. Richter, K. A. Williams, S. Fang, K. R. Subbaswamy, Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506-0055, USA. S. Bandow, Instrument Center, Institute for Molecular Science, Myodaiji, Okazaki 444, Japan. B. Chase, Dupont Experimental Station, E328163, P.O. Box 80328, Wilmington, DE 19880-0328, USA. M. Menon, Department of Physics and Astronomy and Center for Computational Sciences, University of Kentucky, Lexington, KY 40506-0055, USA. A. Thess and R. E. Smalley, Department of Chemistry, Rice University, Houston, TX 77005, USA. G. Dresselhaus, Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. M. S. Dresselhaus, Department of Physics and Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Science. 1997 Jan 10;275(5297):187-91. doi: 10.1126/science.275.5297.187.
Single wall carbon nanotubes (SWNTs) that are found as close-packed arrays in crystalline ropes have been studied by using Raman scattering techniques with laser excitation wavelengths in the range from 514.5 to 1320 nanometers. Numerous Raman peaks were observed and identified with vibrational modes of armchair symmetry (n, n) SWNTs. The Raman spectra are in good agreement with lattice dynamics calculations based on C-C force constants used to fit the two-dimensional, experimental phonon dispersion of a single graphene sheet. Calculated intensities from a nonresonant, bond polarizability model optimized for sp2 carbon are also in qualitative agreement with the Raman data, although a resonant Raman scattering process is also taking place. This resonance results from the one-dimensional quantum confinement of the electrons in the nanotube.
通过使用激光激发波长在514.5至1320纳米范围内的拉曼散射技术，对在结晶绳中以紧密堆积阵列形式存在的单壁碳纳米管（SWNTs）进行了研究。观察到许多拉曼峰，并将其与扶手椅对称（n, n）单壁碳纳米管的振动模式进行了识别。拉曼光谱与基于用于拟合单个石墨烯片二维实验声子色散的C-C力常数的晶格动力学计算结果高度吻合。尽管同时也发生了共振拉曼散射过程，但从针对sp2碳优化的非共振键极化率模型计算出的强度在定性上也与拉曼数据相符。这种共振是由纳米管中电子的一维量子限制导致的。
