摘要:

AbstractThe normal Raman spectrum (NRS), Fourier transform infrared spectrum (FTIRS) and surface‐enhanced Raman spectrum (SERS) of the important insecticide and acaricide fluvalinate (C26H22ClF3N2O3) were recorded for the first time. The spectral data are discussed in terms of characteristic chemical group frequencies and bonds. The fingerprint regions of fluvalinate vibrations that are distinct in FTIRS are identified and presented with the different fingerprint frequencies that are only characteristic to NRS. The enhancement of the benzene ring‐breathing vibration of fluvalinate in SERS is a useful mode for trace analysis for residues of this pesticide at the subnanogram level. The vibrational spectra and polarization characteristics of NRS frequencies are useful as reference spectra for this pesticide in the qualitative analysis of its resid

ISSN:0377-0486    

DOI:10.1002/jrs.1250240302

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractRoom‐temperature Raman spectra of LiRbSO4were studied as a function of pressure up to 170 kbar for two different orientations of the crystal. Four pressure‐induced phase transitions at about 2, 17, 32 and 57 kbar were observed. The transitions at 17 and 57 kbar have slow kinetics, taking about 4 h for their completion. These phase transitions are associated with the orientations of the SO4ions in the unit c

ISSN:0377-0486    

DOI:10.1002/jrs.1250240303

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractUnpolarized Raman spectra of RbLiSO4were obtained for pressures in the range 1 atm–9.5 GPa. Several modifications observed in the spectra were interpreted in terms of two‐phase transitions. The critical pressures for these transitions were determined at 2.5 and 5.5 GPa on increasing the pressure. The first transition is irreversible and can also occur for pressures>2.5 GPa, although through a process varying slowly. The higher pressure transition is reversible but with a marked hystere

ISSN:0377-0486    

DOI:10.1002/jrs.1250240304

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractThe behaviour of the stretching vibration of the two CO groups in free theophylline and in some of its metallic complexes of stoichiometry [MII(tp)2(H2O)4] were investigated by means of infrared and Raman spectroscopy. It is demonstrated that after complexation an inversion of the relative band positions of these two stretching modes takes place. This behaviour could be clearly explained on the basis of the structural characteristics of the investigated complexe

ISSN:0377-0486    

DOI:10.1002/jrs.1250240305

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractRaman spectra of vapor, liquid and low‐temperature crystalline phases and infrared spectra of vapor and low‐temperature amorphous and crystalline phases of isopropylformate [HCOOCH(CH3)2] and of four of its isotopomers, DCOOCH(CH3)2, DCOOCH(CD3)2, HCOOCD(CD3)2and DCOOCD(CD3)2, are reported. The spectra indicate on dominant conformer in all the phases studied. In the vapor and liquid phases, however, indications are found for the presence of a small amount of a second conformer which is believed to have thes‐trsnester conformation. Vapor‐phase asymmetric‐top infrared contour simulation of the carbonyl stretching vibration shows that for the principal conformer the ester function hass‐cisconformation whereas the isopropyl group shows a quasi‐gauc

ISSN:0377-0486    

DOI:10.1002/jrs.1250240306

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractThe anomalous frequency non‐coincidence effect in strongly interacting liquids (ωiso<ωIR) was interpreted in terms of non‐resonant splitting caused by short‐range interparticle repulsion. The shift of the in‐phase component of the split lines was found to depend mainly on dsi/dQj, the derivative of the vibrational displacement of theith atom with respect to the normal coordinat ofjth vibration. For molten potassium thiocyanate, the numerical estimations agree well with the experime

ISSN:0377-0486    

DOI:10.1002/jrs.1250240307

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractThe trisodium salt of 2‐(4‐sulphophenylazo)‐1,8‐dihydroxynaphthalene‐3,6‐disulphonic acid (SPADNS) was studied by Raman and surface‐enhanced Raman spectroscopy (SERS) techniques. The Raman spectra of SPADNS powder and aqueous solution were investigated and an assignment of the Raman bands was made taking into account its infrared absorpiton spectrum. SPADNS tatomers, o‐hydroxyazo and o‐quinone hydrazone, are also discussed. Although the assignment is still preliminary owing to the complex structure of the SPADNS molecule, it provides useful information for SERS investigations of SPADNS in aqueous silver sol and on silve film. The results of SERS are compared with those of visible absorption spectra and x‐ray photoelectron spectra (XPS) and the adsorption configuration of the SPADNS molecule on a silver su

ISSN:0377-0486    

DOI:10.1002/jrs.1250240308

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractGood‐quality high‐TcYBa2Cu3O7−xthin films deposited by the laser ablation method were investigated by Raman spectrosocpy. The vibrational spectra of thin films of YBa2Cu3O7−xat various laser intensities and with different polarizations were measured. The Raman modes change on increasing the laser power and in general such changes are reversible. However, as the laser intensity is increased above a certain value, dramatic changes occur in the Raman peaks, as a result of damage to the

ISSN:0377-0486    

DOI:10.1002/jrs.1250240309

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

ISSN:0377-0486    

DOI:10.1002/jrs.1250240301

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY