6 papers
Effects of bond disorder and surface amorphization on optical phonon lifetimes and Raman peak shape in crystalline nanoparticles
Oleg I. Utesov, Sergei V. Koniakhin, Andrey G. Yashenkin
Optical phonons in nanoparticles with the randomness of interatomic bonds are considered both analytically and numerically. For weak dilute disorder two qualitatively different reg…
Lifetimes of Confined Optical Phonons and the Shape of a Raman Peak in Disordered Nanoparticles: II. Numerical Treatment
Sergei V. Koniakhin, Oleg I. Utesov, Andrey G. Yashenkin
Disorder-induced broadening of optical vibrational eigenmodes in nanoparticles of nonpolar crystals is studied numerically. The methods previously used to treat phonons in defectle…
Lifetimes of Confined Optical Phonons and the Shape of a Raman Peak in Disordered Nanoparticles: I. Analytical Treatment
Oleg I. Utesov, Andrey G. Yashenkin, Sergei V. Koniakhin
Microscopic description of Raman spectra in nanopowders of nonpolar crystals is accomplished by developing the theory of disorder-induced broadening of optical vibrational eigenmod…
Evidence of absorption dominating over scattering in light attenuation by nanodiamonds
S. V. Koniakhin, M. K. Rabchinskii, N. A. Besedina +3
We show an experimental evidence of the domination of absorption over scattering in absorbance spectra of detonation nanodiamonds. We perform the absorbance measurements on the UV-…
Raman spectra of nanoparticles: elasticity theory-like approach for optical phonons
O. I. Utesov, A. G. Yashenkin, S. V. Koniakhin
A simple way to investigate theoretically the Raman spectra (RS) of nonpolar nanoparticles is proposed. For this aim we substitute the original lattice optical phonon eigenproblem…
Novel approach to Raman spectra of nanoparticles
S. V. Koniakhin, O. I. Utesov, I. N. Terterov +3
In crystalline nanoparticles the Raman peak is downshifted with respect to the bulk material and has asymmetric broadening. These effects are straightly related to the finite size…