摘要:

AbstractA quantitative analysis is made of the problem of obtaining accurate polarization measurements in Raman microspectroscopy. The introduction of experimentally determined correction factors arising from the optical properties of the beam splitter allows the depolarization by the microscope objective to be studied separately. Correction curves are calculated for the various parameters which characterize the light‐excitation path and the light‐collection path. These parameters are functions of both the numerical aperture of the objective and the refractive index of the (isotropic) sample. The introduction of these parameters into the expressions for the depolarization ratios of various Raman and resonance Raman bands accounts well for the differences noted between the results of the present microprobe measurements and those obtained with conventional instruments. The values determined here are, within experimental error, in agreement with the calculated results over a large range of depolarization rat

ISSN:0377-0486    

DOI:10.1002/jrs.1250180502

出版商:John Wiley&Sons, Ltd.    

年代:1987

数据来源: WILEY

摘要:

AbstractA Raman microprobe technique was applied to analyse the chemical components at the interface layer between dental adhesive resins and dentine. Raman spectra from each spot (ca.2 μm in diameter) on the flat surface perpendicular to the interface were measured individually. These spectra indicate the coexistence of the resin and dentine components in a thin layer (ca.5 μm in depth) of the dentine side. This provides spectroscopic evidence for the formation of resin‐reinforced dent

ISSN:0377-0486    

DOI:10.1002/jrs.1250180503

出版商:John Wiley&Sons, Ltd.    

年代:1987

数据来源: WILEY

摘要:

AbstractA l'image des interpréteurs PAIRS (spectroscopie infrarouge) et PARS (spectroscopie Raman) pour des fonctions organiques, un troisième interpréteur PARSM a été élaboré. Cet interpréteur sert à la reconnaissance de fonctions chimiques et minéralogiques souvent rencontrées dans I'étude des inclusions fluides. Après une petit aperçu sur l'importance de la spectroscopie Raman pour l'étude des inclusions fluides, nous décrivons la démarche utilisée pour la mise

ISSN:0377-0486    

DOI:10.1002/jrs.1250180504

出版商:John Wiley&Sons, Ltd.    

年代:1987

数据来源: WILEY

摘要:

AbstractResonance CARS spectra of the short‐lived photoisomer of pinacyanol were obtained. From the CARS line frequencies, intensities, line shapes and depolarization ratios it can be concluded that acis‐isomer rather than a twisted configuration is obser

ISSN:0377-0486    

DOI:10.1002/jrs.1250180505

出版商:John Wiley&Sons, Ltd.    

年代:1987

数据来源: WILEY

摘要:

AbstractRaman and infrared spectra of crystalline tin tetrabromide at temperatures between 20 K and the melting point, 304 K, are reported. No evidence of any solid‐state phase transition was found. Splittings of the four molecular modes are discussed in terms of crystal field effects and isotopic species. All twelve Raman and five of the nine infrared‐active lattice modes, predicted on the basis of a group theoretical analysis, have been observed. Since these peaks lie within a relatively narrow frequency range, and since the molecules are located on general sites in the unit cell, mixing between modes is likely to be considera

ISSN:0377-0486    

DOI:10.1002/jrs.1250180506

出版商:John Wiley&Sons, Ltd.    

年代:1987

数据来源: WILEY

摘要:

AbstractLaser Raman spectroscopy has been demonstrated to be a useful technique for making temperature measurements in single‐phase water vapor at atomospheric pressure over the temperature range 393–593 K. It has also been demonstrated that laser Raman spectroscopy can measure water vapor temperatures in non‐equilibrium dispersed two‐phase flow over the temperature range 393‐353 K in spite of large Rayleigh and Mie scattering from droplets. Estimated temperature uncertainties are ±15 K for single‐phase and ±22 K for tw

ISSN:0377-0486    

DOI:10.1002/jrs.1250180507

出版商:John Wiley&Sons, Ltd.    

年代:1987

数据来源: WILEY

摘要:

AbstractInfrared and resonance Raman spectra of 1‐hydroxy‐9, 10‐anthraquinone, its deuteriated and deprotonated forms and its metal chelates with CuII, NiIIand CoIIions are presented. Vibrational assignments of the carbonyl, hydroxyl and the chelating unit of this chromophore are emphasized. It is found that the different metal ions force delocalization of the electrons on the chelate rings to different extents. The intensities of the Raman bands under resonance conditions suggest that the electronic band in the visible region is mainly of a charge‐transfer type from the metal to the

ISSN:0377-0486    

DOI:10.1002/jrs.1250180508

出版商:John Wiley&Sons, Ltd.    

年代:1987

数据来源: WILEY

摘要:

AbstractThe UV Raman excitation profiles ofl‐cystine have been measured between 220 and 514.5 nm. No enhancement is observed from the lowest energy electronic transition (λmax= 245 nm). The excitation profiles for the SS, CS and CO stretching vibrations are each satisfactorily modeled by standard AlbrechtA‐term pre‐resonance expressions which indicate that the Raman intensities derive from a state(s) atca170 nm which is probably σ → σ*in character. Selective enhancement of disulfide stretching vibrations in proteins will require excitation in the vacuum UV

ISSN:0377-0486    

DOI:10.1002/jrs.1250180509

出版商:John Wiley&Sons, Ltd.    

年代:1987

数据来源: WILEY

摘要:

AbstractVibrational assignments are proposed for the room‐temperature FTIR and laser Raman microprobe spectra of solid uridine. These assignments are based chiefly on comparisons of the vibrational data observed for uracil,D‐ribose and a 1:1 mixture of these two compounds with those for the uridine nucleoside its

ISSN:0377-0486    

DOI:10.1002/jrs.1250180510

出版商:John Wiley&Sons, Ltd.    

年代:1987

数据来源: WILEY

摘要:

AbstractRoom‐temperature FT‐IR, photoacoustic and micro‐Raman spectra are reported for the fundamental and binary ν(CO) overtone and combination regions of solid Ru3(13CO)12(13C‐enriched 99.98%) and Ru3(CO)12. These results, together with solution FT‐IR data, have enabled some vibrational assignments

ISSN:0377-0486    

DOI:10.1002/jrs.1250180511

出版商:John Wiley&Sons, Ltd.    

年代:1987

数据来源: WILEY