title: Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems.
abstract: This paper briefly describes how nanowires with diameters corresponding to 1 to 5 atoms can be produced by melting a range of inorganic solids in the presence of carbon nanotubes. These nanowires are extreme in the sense that they are the limit of miniaturization of nanowires and their behavior is not always a simple extrapolation of the behavior of larger nanowires as their diameter decreases. The paper then describes the methods required to obtain Raman spectra from extreme nanowires and the fact that due to the van Hove singularities that 1D systems exhibit in their optical density of states, that determining the correct choice of photon excitation energy is critical. It describes the techniques required to determine the photon energy dependence of the resonances observed in Raman spectroscopy of 1D systems and in particular how to obtain measurements of Raman cross-sections with better than 8% noise and measure the variation in the resonance as a function of sample temperature. The paper describes the importance of ensuring that the Raman scattering is linearly proportional to the intensity of the laser excitation intensity. It also describes how to use the polarization dependence of the Raman scattering to separate Raman scattering of the encapsulated 1D systems from those of other extraneous components in any sample.
authors.affiliation: School of Physics and Astronomy, University of Southampton; d.c.smith@soton.ac.uk.
authors.forename: David C
authors.initials: DC
authors.lastname: Smith
authors.affiliation: School of Physics and Astronomy, University of Southampton.
authors.forename: Joseph H
authors.initials: JH
authors.lastname: Spencer
authors.affiliation: Department of Physics, University of Warwick.
authors.forename: Jeremy
authors.initials: J
authors.lastname: Sloan
authors.affiliation: School of Physics and Astronomy, University of Southampton.
authors.forename: Liam P
authors.initials: LP
authors.lastname: McDonnell
authors.affiliation: Department of Physics, University of Warwick.
authors.forename: Harrison
authors.initials: H
authors.lastname: Trewhitt
authors.affiliation: Department of Physics, University of Warwick.
authors.forename: Reza J
authors.initials: RJ
authors.lastname: Kashtiban
authors.affiliation: Institut des Matériaux Jean Rouxel, University of Nantes CNRS.
authors.forename: Eric
authors.initials: E
authors.lastname: Faulques
mesh_terms: D008027:Light; D037742:Nanotubes, Carbon; D053770:Nanowires / Q000032:analysis*; D013059:Spectrum Analysis, Raman / Q000379:methods*; D014732:Vibration
chemical_list: D037742:Nanotubes, Carbon