Showing papers on "Fourier transform spectroscopy published in 1982"
TL;DR: A method for obtaining the three-dimensional distribution of chemical shifts in a spatially inhomogeneous sample using Fourier transform NMR is presented and an estimated signal/noise ratio of 20 in 10 min is obtained.
Abstract: A method for obtaining the three-dimensional distribution of chemical shifts in a spatially inhomogeneous sample using Fourier transform NMR is presented. The method uses a sequence of pulsed field gradients to measure the Fourier transform of the desired distribution on a rectangular grid in (k,t) space. Simple Fourier inversion then recovers the original distribution. An estimated signal/noise ratio of 20 in 10 min is obtained for an "image" of the distribution of a 10 mM phosphorylated metabolite in the human head at a field of 20 kG with 2-cm resolution.
1,044 citations
110 citations
Book•
01 Feb 1982
TL;DR: Fourier Transform Spectroscopy (FT-Spectroscopy) as discussed by the authors is one of the most widely used transform-based methods in spectroscopy, and has been used in many applications in chemistry.
Abstract: Advantages of Transform Methods in Chemistry.- Hadamard and Other Discrete Transforms in Spectroscopy.- Processing Software for Fourier Transform Spectroscopies.- Dispersion versus Absorption (DISPA): Hilbert Transforms in Spectral Line Shape Analysis.- Fourier Transform Ion Cyclotron Resonance Spectroscopy.- Fourier Transform Nuclear Quadrupole Resonance Spectroscopy.- Fourier Transform Dielectric Spectroscopy.- Pulsed Fourier Transform Microwave Spectroscopy.- Two-Dimensional Fourier Transform NMR Spectroscopy.- Endor Spectroscopy by Fourier Transformation of the Electron Spin Echo Envelope.- Advances in FT-NMR Methodology for Paramagnetic Solutions: Detection of Quadrupolar Nuclei in Complex Free Radicals and Biological Samples.- Fourier Transform ?SR.- Fourier Transform Infrared Spectrometry.- Aspects of Fourier Transform Visible/UV Spectroscopy.- Fourier Transform Faradaic Admittance Measurements (FT-FAM): A Description and Some Applications.- Optical Diffraction by Electrodes: Use of Fourier Transforms in Spectroelectrochemistry.- List of Contributors.
93 citations
TL;DR: In this paper, the Fourier transform spectroscopy was used to detect small perturbations in the A and D states of the NO system, and accurate energy term values were obtained for the A 2 Σ+ (v = 0 to 4), D 2Σ+ and E 2 ǫ+ vibrational levels.
Abstract: The D 2Σ+ → A 2Σ+, E 2Σ+ → D 2Σ+ and E 2Σ+ → A 2Σ+ systems of NO have been recorded at high resolution by Fourier transform spectroscopy. Numerous small perturbations in the A and D states are observed for the first time. Accurate energy term values are obtained for the A 2Σ+ (v = 0 to 4), D 2Σ+ (v = 0 to 4) and E 2Σ+ (v = 0 to 2) vibrational levels.
68 citations
66 citations
TL;DR: In this paper, the A4Π-X4Σ− electronic transition of VO in the near infrared was recorded at Doppler-limited resolution by Fourier transform spectroscopy.
65 citations
TL;DR: Polarization modulation has been combined with Fourier transform infrared (FT-IR) spectroscopy to yield a sensitive method for obtaining infrared reflection-absorption spectra of monolayer films adsorbed on low-area metal surfaces as mentioned in this paper.
Abstract: Polarization modulation has been combined with Fourier transform infrared (FT-IR) spectroscopy to yield a sensitive method for obtaining infrared reflection-absorption spectra of monolayer films adsorbed on low-area metal surfaces. A 10-A film of cellulose acetate adsorbed on a polished copper coupon was examined and the results compared with spectra obtained on the same instrument without polarization modulation. The signal-to-noise ratio is significantly better with the polarization modulation approach. The new method has the additional advantage of being sensitive only to molecules adsorbed on the surface. IR absorption by background gases is not detected.
64 citations
TL;DR: In this article, the authors measured Vibrational circular dichroism for several chiral ring molecules in the mid-infrared frequency range 1600-900 cm− using a Fourier transform infrared spectrometer.
56 citations
01 Jan 1982
TL;DR: In this article, the Fourier Transform Nuclear Quadrupole Resonance (FT-NQR) spectroscopy is used to detect pure quadrupole coupling transitions in solids.
Abstract: FT-NQR (Fourier Transform Nuclear Quadrupole Resonance) spectroscopy is one of the newer analytical tools. Although nuclear quadrupole coupling constants were first observed in atoms by Schmidt and Schuler1 in 1935 and in molecules by Kellog2 and coworkers in 1936, it was the discovery of pure quadrupole coupling transitions in solids by Dehmelt and Kruger3,4 in 1950 and 1951 that initiated the understanding of the NQR phenomenon as presently utilized.
55 citations
51 citations
27 Jul 1982
TL;DR: Absorption and dichroism measurements using Fourier transform spectroscopy and Mirage detection are found to be 3 orders of magnitude more sensitive than conventional photoacoustic spectroscopic measurements.
Abstract: Absorption and dichroism measurements using Fourier transform spectroscopy and Mirage detection are found to be 3 orders of magnitude more sensitive than conventional photoacoustic spectroscopy.
TL;DR: In this article, about 1500 N2O absolute wavenumbers measured in vacuum were provided, covering a range of 225 to 125 cm−1, with accuracies from 50 to 125cm−1.
Abstract: About 1500 N2O absolute wavenumbers measured in vacuum are provided. They cover a range of 225 cm−1, centered around 1250 cm−1. Their absolute accuracy extends from 50 to 125 × 10−6 cm−1 (1.5 to 4 ...
TL;DR: In this paper, a combination of sub-Doppler laser Stark spectroscopy and Doppler-limited Fourier transform was used to study the ν2 fundamental band of H2CO.
TL;DR: In this article, a normalization procedure for IR-photo-acoustic spectroscopy spectra of solids and liquids is discussed and applied to experimental data obtained on polymeric samples.
Abstract: Photoacoustic spectra of materials obtained using the Fourier transform technique require normalization to achieve correct relative peak heights over the spectral range studied. This paper discusses procedures for obtaining quantitative Fourier transform IR-photoacoustic spectroscopy spectra of solids and liquids. A normalization routine for absorption amplitudes is discussed and applied to experimental data obtained on polymeric samples.
TL;DR: In this article, the Fourier transform interferometer was used to record the strongly perturbed a′ 3 Σ -a 3 Π system of CO with high resolution with a Fourier Transform Interferometer (FTI).
TL;DR: In this paper, a method for eliminating baseline distortions due to spurious ringings in Fourier transform NMR spectra involving broad resonances is proposed, which is based on the pulse sequence (π/2) −(Acquistion/Add) −π−τ−π−π+π+2) (Acquisition/subtract) and τ is of the order of or shorter than the spectrometer recovery time.
Abstract: A method is proposed for eliminating baseline distortions due to spurious ringings in Fourier transform NMR spectra involving broad resonances. It is based on the pulse sequence (π/2)–(Acquistion/Add)–π–τ–(π/2) (Acquisition/Subtract). τ is of the order of, or shorter than, the spectrometer recovery time. The sensitivity of the method is discussed.
TL;DR: A review of analytical applications of matrix isolation Fourier transform infrared spectroscopy is presented in this paper, along with practical techniques for obtaining analytically useful results, and a few studies relating to matrix isolation used in conjunction with Raman and conventional IR Spectroscopy are reviewed.
Abstract: A review of analytical applications of matrix isolation Fourier transform infrared spectroscopy is presented. The characteristics of matrix isolation spectroscopy are discussed along with practical techniques for obtaining analytically useful results. A few studies relating to matrix isolation used in conjunction with Raman and conventional IR spectroscopy are reviewed. The majority of analytical applications of matrix isolation vibrational spectroscopy has entailed the use of FT-IR techniques. Qualitative and quantitative results from a number of sample types are presented. The coupling of matrix isolation vibrational spectroscopy with chromatographic separations is reviewed.
TL;DR: In this paper, a Fourier transform spectrometer built with a photothermal beam deflection detector was used to record infrared spectra of organic and inorganic solids, and the total absence of sample-containing devices makes it possible to examine portions of the surfaces of objects which are very large in size.
Abstract: Infrared spectra were recorded of organic and inorganic solids with a Fourier transform spectrometer built to operate with a photothermal beam deflection detector. No sample preparation or cells per se is needed to examine milligram quantities of powder. The total absence of sample-containing devices makes it possible to examine portions of the surfaces of objects which are very large in size. Sample heating may occur, so that care must be taken with heat-sensitive materials.
TL;DR: In this article, the combination of electron spectroscopy for chemical analysis (ESCA) and Fourier transform (FT-IR) was tested for usefulness in surface analysis and the result verifies effective combination of these two complementary techniques.
Abstract: The combination of electron spectroscopy for chemical analysis (ESCA) and Fourier transform was tested for usefulness in surface analysis. The surface sensitivity of IR was increased by the use of IR reflection absorption spectrometry (IR-RAS) coupled with FT-IR. Examination of oxide layers of thickness of about 100 A formed on copper plates with both techniques together with ellipsometry is described in detail. Growth of oxide layers of different composition corresponding to different heating temperatures was manifested with the analysis. The result verifies effective combination of these two complementary techniques. 14 figures, 1 table.
TL;DR: In this paper, a servo-controlled hydraulic tensile tester was used to measure the structural changes in macromolecules in the form of stress-strain curves.
TL;DR: In this paper, the features of a microwave Fourier transform spectrometer in the X-and Ku-band were applied to the investigation of the hyperfine structure of rotational transitions.
Abstract: Abstract In memory of W. H. We discuss the features of a microwave Fourier transform spectrometer in the X-and Ku-band as applied to the investigation of the hyperfine structure of rotational transitions. The Nitrogen-hyperfine structure of vinylisocyanide was measured and analysed.