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Using the first principles calculations we have studied the vibrational modesand Raman spectra of a (10, 10) single-walled carbon nanotube (SWNT) bundleunder hydrostatic pressure. Detailed analysis shows that the original radialbreathing mode (RBM) of the SWNT bundle disappears after the structural phasetransition (SPT). And significantly a RBM-like mode appears at about 509cm^{-1}, which could be considered as a fingerprint of the SPT happened in theSWNT bundle, and further used to determine the microscopic structure of thebundle after the SPT.

The radial breathing-like mode of the collapsed Single-walled carbon nanotube bundle under hydrostatic pressure