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27 August 2003 Stokes/anti-Stokes Raman spectroscopy of high-pressure carbon oxide (HiPco) single-walled carbon nanotubes
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An analysis of the Raman spectra of single-walled HiPco carbon nanotube powder using laser energies of 1.92 eV, 2.4 eV, 2.5 eV, and 2.7 eV, including a comparison of the Stokes and anti-Stokes contributions is presented. The diameter distribution was determined to be 0.8-1.2nm from the spectral positioning of the Radial Breathing Modes. The diameter distribution is consistent with that determined by NIR absorption spectroscopy. At all excitation energies the profile of the G-line indicates a predominance of semiconducting tubes although at 2.4 eV there is some indication of some contribution from metallic tubes. In all cases the anti Stokes line was weak and the Stokes/anti Stokes ratio was at least an order of magnitude indicating at most weak resonance enhancement in either.
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Elizabeth Gregan, Sinead Mary Keogh, Theresa G. Hedderman, Gordon Chambers, and Hugh James Byrne "Stokes/anti-Stokes Raman spectroscopy of high-pressure carbon oxide (HiPco) single-walled carbon nanotubes", Proc. SPIE 4876, Opto-Ireland 2002: Optics and Photonics Technologies and Applications, (27 August 2003);

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