MARI spectrometer

Figure 16 Cut of S(QX, Qy, 0) along Qy for a KHCO3 singlecrystal at 20 K. Comparison of the measured profile with the MARI spectrometer (solid line with error bars) to the best fit (dash line) obtained with Eq. (16) convoluted with a triangular resolution function. Triangular functions ( ) were attributed to other scattering processes. uly = 1.26 x 10 2 A2...

Elastic neutron scattering experiments performed on single crystals with the MARI spectrometer at the ISIS pulsed neutron source (Rutherford Appleton Laboratory, Chilton UK)3 have evidenced quantum interference in accordance with Eq. (20) [Ikeda 1999], For example, the best fit to the cut of S (Qx, Qy, 0) along Qy is presented in Fig. 16. 

The interaction of hydrogen chloride with alumina was also investigated with the same instruments. Changes in the surface hydroxyl groups 29b) were observed that were directly correlated with the active sites. The combination of information from the TOSCA and MARI neutron scattering spectrometers to solve problems in surface chemistry is a powerful method that will undoubtedly be exploited further. It is through an improved awareness of reactant-catalyst interactions that increased efficiencies of industrial chemical processes can be recognized and realized. 

Conventional samples are pure compoimds, or mixtures of such, where the only requirement is to measure their INS spectrum at low temperature, irrespective of how exotic they may be. Each INS spectrometer has different requirements in terms of sample shape FANS at NIST uses cylindrical samples, TOSCA at ISIS uses a flat plate and MARI at ISIS uses an annular shape. 

M. Arai, A.D. Taylor, S.M. Beimington Z.A. Bowden (1992). In Recent Developments in the Physics of Fluids, eds. W.S. Howells A.K. Soper, F321-F328, Adam Hilger, Bristol. MARI—a new spectrometer for liquid amorphous materials. 

The INS spectrum of rubidium hexahydridoplatinate(IV), Rb2[PtH6], obtained on the direct geometry spectrometer MARI, is given in Fig. 5.10. As anticipated from the considerations presented above the spectrum consists of a series of ridges, all relatively well-defined in energy but broad as a function of Q. The point where the scattering reaches a maximum (as a function of Q) defines the mass-line that joins that point to the origin, for an effective mass, /Weff. 

Fig. 5.10 The INS spectrum of Rb2[PtH]j, taken on a direct geometry spectrometer (MARI, ISIS) [20]. Showing the ridges that are due to the variation of band intensities with momentum and energy transfer.

The method developed by Mari et al. (2009) consisted of solid-phase extraction by Bond Elut Certify LRC cartridges (Varian, Harbor City, CA), and derivatiza-tion of samples with BSTFA. A gas chromatography—mass spectrometer (GC—MS, Thermoquest Trace GC/Finnigan Polaris Q MS) was employed for the analysis of cocaine, benzoylecgonine, and morphine. Recoveries were higher than 87% for all the compounds and the limits of quantification were lower than 25 ng/L. 

Other companies that formerly made FT-IR spectrometers but (to the best of our knowledge are no longer involved in this field) include Beckman Instruments, Block Engineering, Bran + Luebbe, Biihler Instruments, Carson Alexiou, Chelsea Instruments, Coderg, Grubb Parsons, Hewlett-Packard, Idealab, JEOL, J. J. Lloyd, Polytec, Queen Mary Instruments, Research and Industrial Instruments Corp. (RIIC), and Unicam. 

Figure 10 Schematic diagram of the direct-geometry spectrometer MARI at ISIS. Ml, M2 and M3 are incident beam monitors.

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