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Lim, Yong-Sik,Nugraha, Ahmad R. T.,Cho, Sung-Jae,Noh, Min-Young,Yoon, Eun-Jin,Liu, Huaping,Kim, Ji-Hee,Telg, Hagen,Há,roz, Erik H.,Sanders, Gary D.,Baik, Sung-Hoon,Kataura, Hiromichi,Doorn, Step American Chemical Society 2014 NANO LETTERS Vol.14 No.3
<P>Using a macroscopic ensemble of highly enriched (6,5) single-wall carbon nanotubes, combined with high signal-to-noise ratio and time-dependent differential transmission spectroscopy, we have generated vibrational modes in an ultrawide spectral range (10–3000 cm<SUP>–1</SUP>). A total of 14 modes were clearly resolved and identified, including fundamental modes of A, E<SUB>1</SUB>, and E<SUB>2</SUB> symmetries and their combinational modes involving two and three phonons. Through comparison with continuous wave Raman spectra as well as calculations based on an extended tight-binding model, we were able to identify all the observed peaks and determine the frequencies of the individual and combined modes. We provide a full summary of phonon frequencies for (6,5) nanotubes that can serve as a basic reference with which to refine our understanding of nanotube phonon spectra as well as a testbed for new theoretical models.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-3/nl404536b/production/images/medium/nl-2013-04536b_0005.gif'></P>