Enhancer spectrum

Conditions (CD3)2SO, 25 °C, 200 MHz H), 50 MHz ( C). (a) Sections of C NMR spectra, in each case with H broadband decoupled spectrum below and NOE enhanced spectrum (gated decoupling) above ... 

Figure 2. Negative FAB mass spectra of maitotoxin. The numbers denote the mass number at the centroid of each peak. A A survey scan at a low resolution (R=300). B. Resolution enhanced spectrum (R=3000) for ion clusters at around m/z 3300. C. Resolution enhanced spectrum (R=3000) for ion clusters at around miz 3400.

Emission depth distribution function (EDDF), 24 89 Emission intensity, 14 835 Emission rate enhancement spectrum,... 

H2 He He rotovibrational band. The density dependence of the H2-He enhancement spectrum in the fundamental band of hydrogen has been measured previously, using a trace of hydrogen in helium of thousands of amagats [121, 175, 142] ternary moments were measured at room temperature. The measurements suggest again greater values of the spectral moments, Table 6.7. 

Fig. 6.16. Theoretical collision-induced absorption enhancement spectrum of H2-He at 77 K, equilibrium H2 obtained in the close coupled scheme after J. Schafer, unpublished. The labels are explained in the text.

In Figure 3.60, the conventional proton spectrum is labeled a. Spectrum b shows the result of irradiation of the 3-methyl group only H-4 is enhanced. Spectrum c shows the result of irradiation of the 5-methyl group both H-4 and H-6 are enhanced-all predictable since enhancement is proximity driven. Some of the details may seem puzzling, but remember that this is a difference experiment The conventional spectrum is subtracted from the irradiated spectrum during the subtraction and enhancement steps, the irradiated peak returns to the up position and the un-irradiated peak is not detectable because it has not been enhanced. The sensitivity... 

By tuning the laser source to the absorption maximum of the chromophore, the Raman spectrum obtained is the enhanced spectrum of that chromophore with little interference from the dense vibration modes of the protein or the water itself. For a quantitative discussion of resonance Raman spectroscopy (14) and its application to biological systems (15), the reader is referred to other papers. 

Because the emission rate at a given wavelength is directly proportional to the optical mode density, the emission rate enhancement spectrum is given by the ratio of the ID cavity mode density to the ID free-space mode density. The enhancement factor at the resonance wavelength is thus given by the ratio of the optical mode densities with and without a cavity, i. e. 

In conclusion, infrared absorption studies on irradiated alkah azides indicate the presence of a triatomic defect of D3J symmetry at 77°K which could be either a trapped N3 excitation or a N3" center. Raman scattering experiments with 6328 A excitation show a resonance-enhanced spectrum for a crystal of KN3 irradiated at 77°K, with a fundamental peak at 307 cm". This peak can be related to a local mode associated with the NJ defect. 

Figure 10.49. A comparison of (a) the conventional ID spectrum of ethyl acetoacetate (60 pmol, 3000 scans, 400 MHz) with (b) the DNP-enhanced spectrum (bOpmol, single scan, 400 MHz). The resonance labelled with an asterisk is missing in trace (a) due to deuteration of the centre as a result of keto-enol tautomerism see text (data courtesy of Oxford Instruments Molecular Biotools).

Figure 6 Computer resolution enhanced spectrum of PPQ (Maximum likelmood algorithm)...

FIGURE 14. (a) 2D J-projection of 5a,14a-androstane with final assignments noted, (b) The corresponding ID resolution-enhanced spectrum of androstane. Both spectra were run at 500 MHz with CDCI3 as solvent. Reprinted by permission of VCH Publishers, Inc., from Reference 50... 

The surface-enhanced spectrum of mixed thin solid films of metallophthalo-cyanines (MPc M Cu, Co) and bis(n-propylimido) perylene materials fabricated by vacuum coevaporation onto Ag island films was scanned at different laser lines by Aroca et alP. The SERS and SERRS imaging indicate that the dyes of the mixed films were physically adsorbed onto the Ag islands. The SERRS imaging is a useful tool to obtain complementary information about the quality of the films, homogeneity and phase separation. 

FIGURE 11.6 MALDI-TOF-MS (matrix DHB) of a mixture of hetero-CHO s obtained after enzymatic degradation of chitosan. The insert shows the enhanced spectrum in the mass range between 2500 and 3500 a.m.u. For peak assignment, see Table 11.2 (unpublished data from this laboratory). 

Fig. 7. Signal assignment in high field region of 300-MHz proton NMR spectrum of neurotoxin II in D O solution at pH 7.3 and 32°C. A - Normal spectrum. B - resolution enhanced spectrum by means of a triangular function(41).

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