Fourier transform studies

Kotler, Z., Nitzan, A., and Kosloff, R. (1988). Multiconfiguration time-dependent self-consistent field approximation for curve crossing in presence of a bath. A fast Fourier transform study, Chem. Phys. Lett. 153, 483-489. 

Detailed Fourier transform studies indicate some of these long-spacing (25 A-30 A) clays are not ideally regular. A sample (No.5) described by Cole (1966) contains 72% rectorite-like layers (AB), 18% single mica layers (A), and 10% double mica layers (AA) for an average of 64% mica layers and 36% expandable layers. 

ArF laser photolyis of H2S seeded in free-jet expansion of Ar used to form Sj. Analysis of LIF spectrum Lifetimes for two vib-rotational levels of Te2(A0 ). Cross-sections for deactivation by Tej Laser emissions from different excited Tcj isotopes Quantum yields for CI2 luminescence at wavelengths 308 nm following VUV excitation in the presence of Ar, Kr, and Xe f Three bound-free transitions observed in LIF from Brj following excitation at 158 nm. Collisional transfer by SF, N2, and He t Near-dissociation behaviour of l2(B n ) tLIF-Fourier transform study of the "near-dissociation behaviour of IjfBO I). Precise value for the well depth of the X state determined... 

Tejedor-Tejedor, M. L, and Anderson, M. (1986) In Situ Alternated Total Fourier Transform Studies on the Goethite Solution Interface, Langmuir 2, 203. 

Freeman, Ray, and Hill, J. D. W. (1971). Fourier transform study of NMR spin-spin relaxation. J. Chem. Phys. 55, 1985-1986. 

Freeman R, Hill H D W 1971 Fourier transform study of NMR spin-lattice relaxation by progressive saturation. J Chem Phys 54 3367-3377... 

Freiser B S 1988 Fourier Transform Mass Speotrometry Techniques for the Study of Ion-Molecule Reactions ed J M Farrar and W FI Saunders Jr (New York Wiley)... 

Zeine C and Grobe J 1997 Diffuse refleotanoe infrared Fourier transform DRIFT speotrosoopy in the preservation of historioal monuments studies on salt migration Mikrochim. Acta 125 279-82... 

Dowrey A E and Maroott C 1982 A double-modulation Fourier transform infrared approaoh to studying adsorbates on metal surfaoes Appl. Spectrosc. 36 414-16... 

Floffmann F M and Weisel M D 1993 Fourier transform infrared refleotion absorption speotrosoopy studies of... 

As mentioned, we also carried out IR studies (a fast vibrational spectroscopy) early in our work on carbocations. In our studies of the norbornyl cation we obtained Raman spectra as well, although at the time it was not possible to theoretically calculate the spectra. Comparison with model compounds (the 2-norbornyl system and nortri-cyclane, respectively) indicated the symmetrical, bridged nature of the ion. In recent years, Sunko and Schleyer were able, using the since-developed Fourier transform-infrared (FT-IR) method, to obtain the spectrum of the norbornyl cation and to compare it with the theoretically calculated one. Again, it was rewarding that their data were in excellent accord with our earlier work. 

Transmission Fourier Transform Infrared Spectroscopy. The most straightforward method for the acquisition of in spectra of surface layers is standard transmission spectroscopy (35,36). This approach can only be used for samples which are partially in transparent or which can be diluted with an in transparent medium such as KBr and pressed into a transmissive pellet. The extent to which the in spectral region (typically ca 600 4000 cm ) is available for study depends on the in absorption characteristics of the soHd support material. Transmission ftir spectroscopy is most often used to study surface species on metal oxides. These soHds leave reasonably large spectral windows within which the spectral behavior of the surface species can be viewed. 

The crystalline mineral silicates have been well characterized and their diversity of stmcture thoroughly presented (2). The stmctures of siHcate glasses and solutions can be investigated through potentiometric and dye adsorption studies, chemical derivatization and gas chromatography, and laser Raman, infrared (ftir), and Si Fourier transform nuclear magnetic resonance ( Si ft-nmr) spectroscopy. References 3—6 contain reviews of the general chemical and physical properties of siHcate materials. 

H-NMR studies were performed on a Bruker MSL-400 spectrometer operating in the Fourier transform mode, using a static multinuclei probehead operating at 400.13 MEtz. A pulse length of 1 iis is used for the 90° flip angle and the repetition time used (1 second) is longer than five times Tjz ( H) of the analyzed samples. 

Electron impact/Fourier transform ion cyclotron resonance mass spectrometry was used to study the mass spectrum of 7 (96MI20). 

In order to study the vibrational properties of a single Au adatom on Cu faces, one adatom was placed on each face of the slab. Simulations were performed in the range of 300-1000"K to deduce the temperature dependence of the various quantities. The value of the lattice constant was adjusted, at each temperature, so as to result in zero pressure for the bulk system, while the atomic MSB s were determined on a layer by layer basis from equilibrium averages of the atomic density profiles. Furthermore, the phonon DOS of Au adatom was obtained from the Fourier transform of the velocity autocorrelation function. ... 

---