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  • 09월 05일 13시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

Observation of Coherent Lattice Vibrations in Micelle-Suspended Single-Wall Carbon Nanotubes

2007년 9월 5일 10시 40분 11초
목9H4심 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 15시 : 30분
물리화학 - Ultrafast Phenomena: Techniques and Applications
저자 및
임용식, Junichiro Kono1, Stephen K. Doorn2, Robert H. Hauge3, Richard E. Smalley3
건국대학교 신소재과학부 전자정보전공,
1Department of Electrical and Computer Engineering, Rice University, USA,
2Division of Chemistry, Chemical Science & Engineering, Los Alamos National Laboratory, USA,
3Carbon Nanotechnology Laboratory, Rice University, USA,
We have generated and detected coherent lattice vibrations in single-walled carbon nanotubes corresponding to the radial-breathing mode (RBM) using ultrashort laser pulses. Because the band gap is a function of diameter, these RBM-induced diameter oscillations cause ultrafast band gap oscillations thereby modulating the interband excitonic resonances at the phonon frequencies (3-9 THz). Excitation spectra show a large number of pronounced peaks allowing the determination of the chiralities present in a particular samples and relative population differences of particular chiralities between samples. The observed RBMs correspond exactly to those seen by CW RRS for the same sample with narrow phonon linewidths, no photoluminescence signal or Rayleigh scattering background to obscure features, and excellent resolution allowing normally blended peaks to appear as distinct features. We have also achieved chiral-selective excitation of RBM modes using a pulse-shaping technique.