Telg H, Maultzsch J, Reich S, Hennrich F, Thomsen C
Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany.
Phys Rev Lett. 2004 Oct 22;93(17):177401. doi: 10.1103/PhysRevLett.93.177401. Epub 2004 Oct 18.
From resonant Raman scattering on isolated nanotubes we obtained the optical transition energies, the radial breathing mode frequency, and the Raman intensity of both metallic and semiconducting tubes. We unambiguously assigned the chiral index (n(1),n(2)) of approximately 50 nanotubes based solely on a third-neighbor tight-binding Kataura plot and find omega(RBM)=(214.4+/-2) cm(-1) nm/d+(18.7+/-2) cm(-1). In contrast to luminescence experiments we observe all chiralities including zigzag tubes. The Raman intensities have a systematic chiral-angle dependence confirming recent ab initio calculations.
通过对孤立纳米管的共振拉曼散射，我们获得了金属性和半导体性纳米管的光学跃迁能量、径向呼吸模式频率以及拉曼强度。我们仅基于第三近邻紧束缚Kataura图明确地确定了约50根纳米管的手性指数(n(1),n(2))，并发现ω(RBM)=(214.4±2) cm(-1) nm/d+(18.7±2) cm(-1)。与发光实验不同的是，我们观察到了包括锯齿形纳米管在内的所有手性。拉曼强度具有系统的手性角依赖性，这证实了最近的从头算计算结果。
