Navegação Ciências Exatas e da Terra por Assunto "Espectros raman"
Resultados 1-8 de 8
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Agglomeration defects on irradiated carbon nanotubes
(2012) [Artigo de periódico]Aligned carbon nanotubes (CNT) were irradiated in the longitudinal and perpendicular directions, with low energy carbon and helium ions in order to observe the formation of defects in the atomic structure. Analysis through ... -
Apparatus for processing of samples at high pressures and high temperatures in a fast quenching-rate regime and synthesis of polyacetylene by pulsed laser heating of confined carbon thin films
(2011) [Artigo de periódico]The pulsed laser heating of confined samples followed by ultrafast cooling constitutes an interesting route to explore the production of new phases and compounds. Indeed, in some cases the ultrafast cooling allows retaining ... -
Electromagnetic weak turbulence theory revisited
(2012) [Artigo de periódico]The statistical mechanical reformulation of weak turbulence theory for unmagnetized plasmas including fully electromagnetic effects was carried out by Yoon [Phys. Plasmas 13, 022302 (2006)]. However, the wave kinetic ... -
Indirect optical absorption and origin of the emission from β-FeSi2 nanoparticles : bound exciton (0.809 eV) and band to acceptor impurity (0.795 eV) transitions
(2010) [Artigo de periódico]We investigated the optical absorption of the fundamental band edge and the origin of the emission from β-FeSi2 nanoparticles synthesized by ion-beam-induced epitaxial crystallization of Fe+ implanted SiO2 / Si 100 followed ... -
Lattice dynamics and spin-phonon coupling in CaMn2O4 : a raman study
(2014) [Artigo de periódico]We present polarized Raman spectra of CaMn2O4 (marokite) measured in several exact scattering configurations from oriented single crystals. Most of the 11Ag + 12B1g + 10B2g + 9B3g Raman-allowed modes are identified and ... -
Processing of amorphous carbon films by ultrafast temperature treatment in a confined geometry
(2001) [Artigo de periódico]A pressure cell with an anvil made of sapphire and the other made of tungsten carbide, was constructed to process thin film samples using a high power Nd:YAG pulsed laser, in a regime of ultrafast quenching rate and confined ... -
Raman spectra of R2O3 (R-rare earth) sesquioxides with C-type bixbyite crystal structure : a comparative study
(2014) [Artigo de periódico]Raman spectra of R2O3 (R—Sc, Er, Y, Ho, Gd, Eu, and Sm) powders with C-type bixbyite crystal structure are measured. With the help of these data and ones, previously published for other oxides from the same structural ... -
Raman study of phonons in CaMn7O12 : effects of structural modulation and structural transition
(2014) [Artigo de periódico]Polarized Raman spectra of oriented CaMn7O12 single crystals have been studied in a broad temperature range (5–500 K) covering the crystallographic, ferroelectric, and magnetic transitions. From the spectra obtained at ...