Chemical contour

Chemical contour maps (or bench maps) are made for the purpose of selective mining of the ore. The chemical contour map is formed by correlating the drill... 

Fig. XVII-18. Contours of constant adsorption energy for a krypton atom over the basal plane of graphite. The carbon atoms are at the centers of the dotted triangular regions. The rhombuses show the unit cells for the graphite lattice and for the commensurate adatom lattice. (From Ref. 8. Reprinted with permission from American Chemical Society, copyright 1993.)...

Let us now turn to the influence of vibrations on exchange chemical reactions, like transfer of hydrogen between two O atoms in fig. 2. The potential is symmetric and, depending on the coupling symmetry, there are two possible types of contour plot, schematically drawn in fig. 17a, b. The O atoms participate in different intra- and intermolecular vibrations. Those normal skeleton... 

Fig. 1.32. (a) Molecular graphs and electron density contours for pentane and hexane. Dots on bond paths represent critical points, (b) Comparison of molecular graphs for bicycloalkanes and corresponding propellanes. (Reproduced from Chem. Rev. 91 893 (1991) with permission of the American Chemical Society.)... 

EMGRESP is a source-term and dispersion emergency response screening tool for calculating downwind contours with a minimum of user input and computational expense in the event of a release of a hazardous chemical. The program provides hazardous contaminant information, calculates toxic concentrations at various distances downwind of a release, and c" the... 

We have previously examined the mutual dependence of [HO ] upon [NO,jj and [NMHC] as calculated by a combined clean/polluted air chemical mechanism (76), and extend those calculations here to the more modem CAL mechanism of Lurmann et al. (182). To do this we have combined the NO,/NMHC chemical reactions of the CAL mechanism with the methane chemistry of Logan et al. (58). The results of these calculations are shown as contour maps or isopleths for [O3], [HO ], and [HO2 ] in Figure 7. Figure 7a, for ozone, is similar to isopleths used to determine reductions in NMHC and/or... 

Figure 7. Ozone, hydroxyl, and hydroperoxyl isopleths calculated using a combined clean/polluted air chemical mechanism. A. [O3] contours, ppb. B. [HO.] contours, 10 molecules cm . C. [H02 ] contours, 10 molecules cm Contours are maximum concentrations achieved in one day exposure to sunlight from starting [NMHC] and [NOJ concentrations on axes.

Room-temperature fluorescence (RTF) has been used to determine the emission characteristics of a wide variety of materials relative to the wavelengths of selected Fraunhofer lines in support of the Fraunhofer luminescence detector remote-sensing instrument. RTF techniques are now used in the compilation of excitation-emission-matrix (EEM) fluorescence "signatures" of materials. The spectral data are collected with a Perkin-Elraer MPF-44B Fluorescence Spectrometer interfaced to an Apple 11+ personal computer. EEM fluorescence data can be displayed as 3-D perspective plots, contour plots, or "color-contour" images. The integrated intensity for selected Fraunhofer lines can also be directly extracted from the EEM data rather than being collected with a separate procedure. Fluorescence, chemical, and mineralogical data will be statistically analyzed to determine the probable physical and/or chemical causes of the fluorescence. 

C07-0027. Construct an accurately scaled composite contour drawing on which you superimpose a 2s orbital, a 2 Px orbital, and the outermost portion of a 3 Px orbital of the same atom. (Use different colors to distinguish the different orbitals.) What does your contour drawing tell you about the importance of the = 2 orbitals for chemical interactions when the 3 Px orbital contains electrons ... 

Heteronuclear two-dimensional /-resolved spectra contain the chemical shift information of one nuclear species (e.g., C) along one axis, and its coupling information with another type of nucleus (say, H) along the other axis. 2D /-resolved spectra are therefore often referred to as /,8-spectra. The heteronuclear 2D /-resolved spectrum of stricticine, a new alkaloid isolated by one of the authors from Rhazya stricta, is shown in Fig. 5.1. On the extreme left is the broadband H-decoupled C-NMR spectrum, in the center is the 2D /-resolved spectrum recorded as a stacked plot, and on the right is the con tour plot, the most common way to present such spectra. The multiplicity of each carbon can be seen clearly in the contour plot. 

Figure 5.2 Presentation of 2D /-resolved spectra. In the ID plot (i), both 8 and / appeared along the same axis, but in the 2D /-resolved spectrum (ii), the multiplets are rotated by 90° at their respective chemical shifts to generate a 2D plot with the chemical shifts (8) and coupling constants (/) lying along two different axes, (iii) The 2D /-resolved spectrum as a contour plot.

Figure 16. Projections onto 2D surfaces of trajectories (in green) of CH3O H2 + HCO. The left column is a projection onto the surface of Fig. 15. The right column is a projection onto the surface of Fig. 14. The black contour represents the saddle point energy for the H+ H2CO H2 + HCO reaction. Blue contours are lower in energy red contours are higher. Reprinted with permission from [67], Copyright 2001 American Chemical Society. (See color insert.)...

Figure 42 (from the chapter Nonadiabatic Chemical Dynamics ) The potential energy contour felt by a hydrogen atom when the two atoms N (left side) and C (right side) are fixed. 

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