摘要:

AbstractRaman and IR spectra of solid powders and solutions of paraquat and derivatives are reported. The fundamental vibrations of each compound have been assigned on the basis of group frequency correlations, isotopic substitution (shifts) and band intensities, as well as depolarization values when applicable.

ISSN:0377-0486    

DOI:10.1002/jrs.1250020602

出版商:John Wiley&Sons, Ltd.    

年代:1974

数据来源: WILEY

摘要:

AbstractIt is shown that by measuring the appropriate diagonal and off‐diagonal tensor con ponents of the Raman spectrum of a cubic crystal and then carrying out a simple subtraction process in a computer it is possible to isolate the totally symmetric Raman spectrum from the other components. The method relies on obtaining the data in digital form using automated spectrometry. The technique is applied to cubic Cr3B7O13Cl, whose Raman spectrum is reported here for the first time. TheA1spectrum at 300K comprises four bands at 176, 209, 375 and 657 cm−1in agreement with group theoretical predictions. In addition, the spectrum contains a prominent wing feature extending to 250 cm−1that is most likely associated with the ferroelectric phase transition at

ISSN:0377-0486    

DOI:10.1002/jrs.1250020603

出版商:John Wiley&Sons, Ltd.    

年代:1974

数据来源: WILEY

摘要:

AbstractA systematic procedure for the interpretation of Raman spectra of carbon‐hydrogen‐ and alcoholic compounds is outlined.The system – based on logical yes/no decisions – gives information on the structure elements present in an unknown molecule.Hardly any interpretation experience is required.The system as developed so far is pr

ISSN:0377-0486    

DOI:10.1002/jrs.1250020604

出版商:John Wiley&Sons, Ltd.    

年代:1974

数据来源: WILEY

摘要:

AbstractRaman spectra of polycrystalline samples of ClCN, BrCN and ICN have been recorded at 79 K and 18 K. The observed frequencies are compared with those obtained from lattice dynamics calculations on these linear‐chain crystals. Spectral dependence on crystallite‐size in ICN and isotope effects in all three crystals are also briefly discus

ISSN:0377-0486    

DOI:10.1002/jrs.1250020605

出版商:John Wiley&Sons, Ltd.    

年代:1974

数据来源: WILEY

摘要:

AbstractA system for the calibration of the absolute spectral response of spectrometers is described using a standard reflector ‐ of the type used especially for colour measurements – as a secondary light source. In contrast to conventional light sources for calibrations, the radiance is approximately constant over the whole area of the source, and the angular characteristic is known for a large range of reflection angles φ. A special advantage is that the angular characteristic follows closely the Lambert‐cosine‐jaw in the region φ∼45°. The radiant flux can be calculated exactly for various experiemental conditions, especially for Raman

ISSN:0377-0486    

DOI:10.1002/jrs.1250020606

出版商:John Wiley&Sons, Ltd.    

年代:1974

数据来源: WILEY

摘要:

AbstractRaman spectra of neat liquidcis−2‐butene andcis−2‐butene‐benzene mixtures, covering the accessible composition range at 20°C and atomospheric pressure, have been obtained. Parameters of the benzene bands at 605.6, 1178 and 991.6 cm−1andcis−2‐butene bands at 395.5, 871.5 and 1660 cm−1are reported. Changes in the parameters as a function of concentration are interpreted in terms of a weak dipole‐induced dipole interaction and the consequent effect on rotational motions and reson

ISSN:0377-0486    

DOI:10.1002/jrs.1250020607

出版商:John Wiley&Sons, Ltd.    

年代:1974

数据来源: WILEY

摘要:

AbstractThe Raman specrum of β‐adenosine‐5′‐phosphoric acid has been observed in its aqueous solution with 6471, 5145, 4880, 4579, 4579, and 3511 Å excitation. An examination of the manner of increase of the intensities of the Raman lines at 1580 and 1484 cm−1of the adenine residue indicated that the electronic excited state corresponding to a weak absorption band at 276 nm is responsible for these Raman scatterings. This idea has been supported by a similar examination of the Raman spectrum of β‐adenosine‐3′,5′‐cyclic phosphoric acid and an examination of the effect of temperature on the Raman spectra of poly rA and poly(rA‐rU). A discussion is included of the geometrical structure of the adenine residue in its lowest‐singlet electronic excited state, based on the vibrational structure of the fluorescence spectrum, the result of a normal coordinate treatment, and the result of a semiempirical Pariser‐Parr‐Pople calculat

ISSN:0377-0486    

DOI:10.1002/jrs.1250020608

出版商:John Wiley&Sons, Ltd.    

年代:1974

数据来源: WILEY

摘要:

AbstractThe Raman spectrum of the addition compound of PCl5· UCl5was recorded. In all, seven major lines were observed. The results were interpreted as supporting the ionic structure of PCl 4+UCl 6−, the cation having aTdsymmetry and the anion anOhsy

ISSN:0377-0486    

DOI:10.1002/jrs.1250020609

出版商:John Wiley&Sons, Ltd.    

年代:1974

数据来源: WILEY

ISSN:0377-0486    

DOI:10.1002/jrs.1250020610

出版商:John Wiley&Sons, Ltd.    

年代:1974

数据来源: WILEY

摘要:

AbstractThe Raman spectrum of gaseous N2F4at a pressure of 760 torr was recorded with a spectral slit width of 3 cm−1. Ten of the expected eleven fundamentals of the symmetric motions of both thegaucheandtransisomers give rise to strongly polarized Raman lines. These new data require a reassignment of some of the fundamentals for both the C2andC2hconformers. The Raman of the solid at 18K was also recorded. Both conformers were found in the solid even after annealing the sample for 9 hours at a temperature of 101.6K and 3 hours at a temperature of 106.8K. Bands attributable to thegaucheisomer became more intense relative to those for thetransisomer after several hours of annealin

ISSN:0377-0486    

DOI:10.1002/jrs.1250020611

出版商:John Wiley&Sons, Ltd.    

年代:1974

数据来源: WILEY