Showing papers in "Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy in 1966"

TL;DR: In this article, the solution and reflection spectra of some neodymium complexes containing ligands having oxygen donors and nitrogen donors have been investigated, and the red shifts of the visible and near infrared bands have been correlated with the covalency parameter δ.

TL;DR: In this paper, a correlation between the frequencies of the NCS bending vibration and the stereochemistry of the compounds is presented, in particular, a clear distinction between tetrahedral and octahedral compounds is possible.

TL;DR: In this article, the infrared and Raman spectra of acetone, d6 and ααα acetone-d3 have been measured and a vibrational assignment has been made.

TL;DR: The infra-red spectra of synthetic hydroxyapatite, Ca 10 (PO 4 ) 6 (OH) 2, and mineral fluoraphatite over the range 4000-250 cm −1 are reported in this article.

TL;DR: In this article, the site symmetry of the anionic group is discussed in terms of the site-symmetry of the X-ray powder diffraction of 19 molybdates and 18 tungstates.

TL;DR: In this article, the spectra of 63 compounds have been recorded as mulls in Nujol and in hexachlorobutadiene and as alkali halide discs.

TL;DR: In this article, the infra-red spectra of either trivalent cations or rare-earth borates related to the calcite, the aragonite and the vaterite structures have been studied in the 1500-250 cm −1 region.

TL;DR: In this article, it was shown that the hydrogen bonds linking trimers and higher polymers are significantly stronger than those of dimers, and that the free OH groups of these dimers are able to form stronger hydrogen bonds than the original monomers.

TL;DR: In this article, a theoretical treatment of attenuated total reflection (ATR) of partially polarized and linearly polarized radiation from the surface of an anisotropic, absorbing film is given, and approximate expressions for the reflectivity are derived for the special case of oriented organic polymer films, and a method for determining the absorption indices along all three principal film axes.

TL;DR: The infra-red spectra of dimethyl sulphide, selenide and telluride in the liquid and vapour phases and also the Raman spectra are reported as discussed by the authors.

TL;DR: In this article, a normal co-ordinate analysis of these complex ions has been made, including all the ligand atoms, in order to check the vibration assignments made experimentally and to clarify the normal modes of vibration for the observed bands.

TL;DR: In this article, the infra-red spectra of benzoic acid in the vapour phase, and in dilute solution in cyclohexane, carbon tetrachloride, and benzene show two bands between 1770 and 1670 cm−1 which are assigned respectively to free and carbonyl groups involved in hydrogen bonding between acid molecules.

TL;DR: In this paper, the authors examined the spectral properties of enamino ketones containing the structural unit O�CO and N(Alk)2 and showed that the band splitting occurring in a number of spectra was due to rotational isomerism.

TL;DR: In this article, the infrared spectra of gaseous (HCOOH) 2, (HCOOD) 2 and (CH3COOH 2 ) were obtained over the range of 33-400 cm−1.

TL;DR: In this paper, a brief outline is given of the two principal ways of determining force constants, the method of force constant refinement and force constant display, with particular reference to the assessment of error in the frequency data employed.

TL;DR: Raman spectra have been studied for the benzene and benzene- d 6 crystals at various temperatures between 4·2° and 273°K as discussed by the authors, showing that all the observed low-frequency Raman bands arise from rotational lattice vibrations (librations).

TL;DR: In this paper, the integrated intensities of the fundamental infra-red absorption bands of CH2F2, CH2Cl2 and CF2CL2 have been measured using the pressure-broadening technique.

TL;DR: The dependence on particle size of the position and shape of certain absorption bands in the spectra of kaolin minerals is attributed to an effect of the oscillating electric fields induced by the vibrating dipoles as mentioned in this paper.

TL;DR: The self-association of dimethyl sulfoxide in carbon tetrachloride at 27° ± 1°C is essentially limited to the formation of dimers in the concentration range 0.08 − 0.30 M and the association constant is estimated to be 0.9 − 1/l as discussed by the authors.

TL;DR: In this article, a critical and systematic evaluation of the feasibility of employing spectral continua as primary sources in atomic absorption spectroscopy is presented. But the results of the evaluation were limited to 32 elements in the periodic system.

TL;DR: In this article, the infra-red spectra in the 667-222 cm−1 region of the phenyltin chlorides and iodides (PhnSnX(4−n), X  Cl and I), triphenyl tin bromide, triphenyltin fluoride, tetraphenyltins and hexaphenylditin as Nujol mulls and as carbon tetrachloride solutions have been recorded.

TL;DR: In this article, the lifetime of conformative molecular states by measurement of the temperature dependence of proton resonance, has been evaluated by using the apparent line width, which is divided into two components.

TL;DR: In this article, a C,C distance of 1·505 ± 0·004 A i.e. 0·02 A shorter than in ethane was obtained. But the result was not accurate.

TL;DR: In this article, the far infra-red spectra of K2PtCl4, k2PdCl4 and k2ptCl6 have been measured in the frequency region from 500 to 600 cm−1 and a normal co-ordinate treatment has been made for these compounds on considering the lattice vibrations.

TL;DR: The literature assignments for PN bonds are discussed in this paper, and it is suggested that this bond is best identified by indirect correlations, such as PNH 2, PNHR, PNR 2,, PNC and PNP groups.

TL;DR: In this article, a new vibrational assignment for pyrimidine d 0 and d 4 was presented, which differs from that given previously by L ord et al. for the six fundamentals ν 6 a, ν 19 a, ν 18 b, and ν 4.

TL;DR: In this article, a new germanium infrared polarizer which is compact enough to be used simultaneously with other spectrophotometer sampling attachments is described, which exhibits radial symmetry about the axis of drawing with the observed dichroic ratios approximately equal to the bulk values.

TL;DR: In this article, the use of vibration frequency shifts due to isotopic substitution at the bridge position in the molecules BF 3, SiF 4 and NO 2 is discussed, using frequency data in the literature for the 10 B, 11 B, 28 Si, 30 Si, 14 N and 15 N species.

TL;DR: In this article, a multiple-scan interference spectrometer is described, and exploratory experiments with the application of the instrument to observe low-temperature emission spectra of various substances, the instrument is highly senstive and could be used for transmission, reflection, and emission spectroscopy, especially in situations where the signals obtained are weak.