3d resonance

One can see, from the upper panel of this figure, that the C60 confinement makes the 3p — 4d resonance in Ca incomparably broader and much higher in its amplitude compared to free Ca. At the same time, the 3p 3d resonance in Ca becomes noticeably narrower compared to free Ca. Qualitatively, the 3p —3d and 3p 4d resonances in cr A become almost equal, to a reasonable approximation, and both have little to resemblance to those in free Ca. 

Xho d sateUit The principal multiplet of the d final state for CuO is known to fall at 12.5 with a smaller one around 10 eV (15). The intensity of the d final state can be enhanced by the Cu 2p 3d resonant excitation process followed by an Auger decay (15). This process is resonant between 72-80 eV. The HTSC s exhibit a similar behavior (j ). The satellites in CuiO and Cu do not have non-resonant components (IS) because the UPS for CuiO and Cu reflect the one-hole DOS. However, the VB XPS of CuO and the HTSC s can and do show a significant nonresonant d satellite (see Figure 1) (23) indeed, it should grow as one approaches the sudden limit. This possibility makes it even more difficult to interpret the XPS data for the HTSC s, since the d satellite at 12.5 in the VB XPS falls at or near the same energy as the Ba spin-orbit split 5p features, which have been very controversial. 

Hirst (1972) gave an explanation for the observability or non-observability of resonance absorption for most of the 3d impurities. He related this problem to the appearanee of a bottleneck situation (see Barnes 1979, 1981). To our knowledge the only 3d resonance, even with a resolved hyperfine structure, in a non-bottleneck case is CePda Mn (Schaeffer and Elschner 1985). CePda is an intermediate-valenee system with an extremely small conduction-electron density of states at the Fermi level. 

L.J. Curtis, H.J. Berry, J. Bromander A meanlife measurement of the 3d resonance doublet in Sill by a teclinique which exactly accounts for cascading. Phys. Lett. A 34, 169 (1971)... 

Y. Yano and S. Oae, 3d Orbital Resonance in the Bivalent Sulfur Atom, Mechanisms of Reactions of Sulfur Compounds, Vol. 4, Intra-Science, 1969, p. 167. 

The stability of sexivalent chromium, in the chromate ion and related ions, can also be understood. The chromic complexes, involving tervalent chromium, make use of d2sp3 bond orbitals, the three remaining outer electrons of the chromium atom being in three of the 3d orbitals, with parallel spins. The resonance energy of these three atomic electrons in a quartet state helps to stabilise the chromic compounds. However, if all of the nine outer orbitals of the chromium atom were available for bond formation, stable compounds might also be expected... 

We have already shown how simultaneous codeposition of two metals in inert-gas matrices can lead to the formation of mixed-metal dimers. As in the case of silver, it was found that irradiation into the atomic absorptions of Cr or Mo results in formation of their respective dimers and trimers (114). In addition to this, however, irradiation into the atomic resonances of the two metals in the presence of each other results (114) in formation of the mixed-metal species CrMo, CrjMo, and CrMo2. It would seem that selective irradiation into the 300-400-nm bands of atomic Cr or Mo excites the 3d 4p, 3dMs 4p , or 4d 5p, ... 

In the spectrum of fully reductively [ C] methylated glycophorin A, the resonance at 42.8 p.p.m. must correspond to the N, N -di[ C]methylated, N-terminal amino acid residue. The ratio of the integrated intensities of the N, N -di[ C]methylLeu resonance to the N, N -di[ C]methyllysine resonances is 5 1, as expected. The integration values determined were valid, because the recycle times of spectra in Figs. 3B, 3C, and 3D were twice the spin-lattice relaxation-times (Tj values) of those of the di[ C]methyl carbon atoms, and also because the n.O.e. values of the N, N -di[ C]methyl and N, N -di[ C]methyl carbon atoms were equivalent. ... 

Fig. 4.—pH-Dependence of the Carbon-13 Resonances for the Di[ C]methylamino Groups of Glycophorin [A, B, and C correspond to the identically labeled peaks in Fig. 3D. Taken from Ref. 56.]...

Figure 6.1 Pulse sequence for 3D experiments obtained by merging two different 2D sequences. (Reprinted from J. Mag. Reson. 84, C. Griesinger, et al, 14, copyright (1989), with permission from Academic Press, Inc.)...

Figure 6.3 Schematic representation of the resolution advantages of 3D NMR spectroscopy, (a) Both pairs of protons have the same resonance frequency, (b) Due to the same resonance frequency, both pairs exhibit overlapping crosspeaks in the 2D NOESY spectrum, (c) When the frequency of the carbon atoms is plotted as the third dimension, the problem of overlapping is solved, since their resonance frequencies are different. The NOESY cross-peaks are thus distributed in different planes.

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