Zobrazeno 1 - 10
of 78
pro vyhledávání: '"S. P. S. Porto"'
Publikováno v:
Applied optics. 10(3)
A three-mirror, multiple beam interferometer is described and analyzed in use as a rejection filter for elastically scattered light in a Raman scattering experiment. A prototype filter capable of attenuating laser source frequency light by a factor o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c3f137f315f07a6ac6e32b2ea05d36e6
https://pubmed.ncbi.nlm.nih.gov/20094485
https://pubmed.ncbi.nlm.nih.gov/20094485
Publikováno v:
Applied optics. 7(10)
The visual observation of optical rotation in quartz with subsequent Rayleigh scattering from crystal imperfections is reported. Observations in which the incident beam travels at an arbitrary angle with the optic axis are described and are shown to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1338b29dea2387716d66f81f7d3e8b2a
https://pubmed.ncbi.nlm.nih.gov/20068910
https://pubmed.ncbi.nlm.nih.gov/20068910
Publikováno v:
physica status solidi (b). 61:K71-K75
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3f672d0fc60a382c4e918ed97d3547fc
https://doi.org/10.1002/pssb.2220610254
https://doi.org/10.1002/pssb.2220610254
Autor:
S. P. S. Porto, P. R. Andrade
Publikováno v:
Annual Review of Materials Science. 4:287-310
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3fbf732da0fc6ad14499a4b203639132
https://doi.org/10.1146/annurev.ms.04.080174.001443
https://doi.org/10.1146/annurev.ms.04.080174.001443
Publikováno v:
Physical Review B. 13:4907-4917
The room-temperature Raman spectra of LiTa${\mathrm{O}}_{3}$ for all symmetry phonons are investigated. We make a new assignment of the phonons, which agrees with the selection rules of a ${C}_{3}$ symmetry instead of ${C}_{3v}$, contrary to Kaminow
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eab73e6902163b6932943651488eb5f2
https://doi.org/10.1103/physrevb.13.4907
https://doi.org/10.1103/physrevb.13.4907
Publikováno v:
Physical Review B. 9:1077-1084
The dielectric constant of sodium chlorate has been analyzed on the basis of a Mason-Debye-type relaxation formula. A consistent description of the temperature dependence of the phonon structure and the dielectric-constant behavior as a function of f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aa367e20f9ec43eaa9a9bd8eeb5f826e
https://doi.org/10.1103/physrevb.9.1077
https://doi.org/10.1103/physrevb.9.1077
Publikováno v:
Physica Status Solidi (b). 90:543-556
The low-frequency B2 Raman spectra of KDP, RDP, RDA, and D-RDA are measured as a function of temperature. The low-frequency data are fitted to the response function of two coupled harmonic oscillators and of two coupled lattice oscillators. The resul
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::74a33565791ca71835b07edaedfd3e04
https://doi.org/10.1002/pssb.2220900213
https://doi.org/10.1002/pssb.2220900213
Publikováno v:
Solid State Communications. 19:491-494
We report a clear cut evidence of a temperature dependent diffusive central mode associated with the ferroelectric phase transition of LiTaO3; a detailed linshape analysis shows that this central mode is a Debye-like relaxation. We also show its infl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::42ac992014fca5270ceef3e29e6cd552
https://doi.org/10.1016/0038-1098(76)90049-1
https://doi.org/10.1016/0038-1098(76)90049-1
Publikováno v:
Ferroelectrics. 11:511-517
The ferroelectric phase transition of tri-glycine sulfate (TGS) at 49°C has been studied by Raman spectroscopy. The spectrum of the external lattice mode region has been followed as a function of temperature. It is found that the modes corresponding
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5c15443ac4f183aed0fe4076d51668a0
https://doi.org/10.1080/00150197608237786
https://doi.org/10.1080/00150197608237786
Publikováno v:
Journal of Raman Spectroscopy. 10:253-290
The group theoretical methods by which the symmetries of normal modes in crystals may be determined are outlined, and a series of tables are presented to facilitate rapid determination of the selection rules for vibrational transitions. Emphasis is p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::01318442cd463f4e20111fda97ab502c
https://doi.org/10.1002/jrs.1250100152
https://doi.org/10.1002/jrs.1250100152