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Moderate acid treatment of double-walled carbon nanotubes (DWCNTs) has given rise to two new experimentally observed second-order double resonant Raman scattering frequencies centered at 1901 cm(-1) and 1942 cm(-1), in the highly dispersive LOLA region. These LOLA overtones and combination modes have been predicted by double resonance theory for two phonons associated with the K- and Gamma-points, respectively.
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Amanda Ellis (2006) studied this question.
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