Resonant broadening

Finally, we return to the specific heat. The effects of the phonon coupling on the ripplon spectrum can be taken into account in the same fashion as in the conductivity case. Here we replace the discrete summation in Eq. (38) by integration over the broadened resonances, as prescribed by Eq. (57). The bump, as shown in Fig. 15, is also predicted to be nonuniversal depending on Tg/oio-The predicted bump for Tg/(Od = 2 seems to match well the available data for... 

Labile protons frequently give rise to broadened resonances in the NMR spectmm and their chemical shifts are critically dependent on the solvent, concentration, and on temperature and they do not have reliable characteristic chemical shift ranges. 

Figure 9. Selective irradiation of dioxane. Homonuclear irradiation of a homogeneously broadened resonance at 67.9 MHz. Spectral details PW = 40 ysec (90° C), D2 = 10 sec, 4 scans accumulated, quadrature detection 15% acetone-dc,...

Collisional redistribution of radiation. A system A + B of two atoms /molecules may be excited by absorption of an off-resonant photon, in the far wing of the (collisionally) broadened resonance line of species A. One may then study the radiation that has been redistributed into the resonance line - a process that may be considered the inverse of pressure-broadened emission. Interesting polarization studies provide additional insights into the intermolecular interactions [118, 388]. 

Reversed Radiation.—A pressure broadened resonance emission line with radiation in the middle of the line virtually absent because of self-absorption near the walls, (e.g., the 2537 A. line obtained from medium pressure mercury lamps). 

The absorption coefficient, of mercury vapor for a Doppler-broadened resonance line is given by the expression ... 

The 2D PE signal for models C and D (Fig. 6) shows inhomogeneously broadened resonances stretched along the — 2i = 02 direction. They represent self-correlations of the one-exciton states and... 

The resonance frequency of the central transition (+1/2 — —1/2) is unchanged by the first-order quadrupolar Hamiltonian. Other (satellite) transitions are, however, shifted by an amount proportional to the first-order quadrupolar coupling constant (oSb The result of this is to substantially broaden resonances from... 

When a spectrum has severely broadened resonances in the presence of less broadened resonances, it is possible to use a Carr-Purcell-Meiboom-Gill spin-echo sequence to remove the broadened resonances, facilitating the interpretation of the remaining signals. By setting certain parameters of the sequence, it is possible to progressively remove peaks with less and less broadening. ... 

Paramagnetic nitroxide radicals (spin labels) have been attached at specific sites on enzymes and inhibitors to perturb H NMR spectra by broadening resonances from amino acid residues near the unpaired... 

The splitting of 7 cps in the triplet is a reasonable value for the vicinal H-H coupling, strongly indicating that ethylene units in the copolymer are isolated from each other. There are no continuous segments of ethylene units in the copolymer. For polymers obtained at relatively high temperatures, additional broadened resonances around 8.0 were observed. These may be attributed to methylene hydrogens in continuous polymeric units of ethylene and other structures. 

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