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Updated: Jun 24, 2026

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
Published on: April 28, 2016
Vibrational spectra and dynamics of electronically excited semiconducting single-walled carbon nanotubes
Ying-Zhong Ma1, Matthew W Graham, Matthew A Prantil
1Department of Chemistry, University of California, Berkeley 94720-1460, USA.
Abstract:
Femtosecond mid-infrared spectroscopy was applied to study the vibrational spectra and dynamics in the electronic excited states of semiconducting single-walled carbon nanotubes (SWNTs). The experiments were performed by exciting SWNTs dispersed individually in polymethylmethacrylate and polyvinyl alcohol polymer films with 40 fs laser pulses at 800 nm, and the resulting responses were monitored with broadband mid-infrared pulses ranging from 1510 to 1670 cm(-1). The structured spectra observed show vibrational bands with up-shifted frequencies by approximately 10-50 cm(-1) with respect to their ground-state counterparts. The observation provides direct evidence for the theoretically predicted lattice distortions in the electronic excited state. Analysis of the kinetics probed in the mid- and near-infrared regions provide an estimate of the time scales for the vibrational relaxation.
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