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991.
Using singly or doubly reflected 270keV-ions from a Cu-surface at grazing incidence nuclear polarizations in7Li ofP I=(6.8±0.6) % orP I= (11.5±1.0) % and in14N ofP I =(14.8±1.0) % orP I=(20.0±1.0) % respectively, have been achieved. 相似文献
992.
It is shown that cycloadditions of 1,3-bis (dimethylamino) pentalenes and their 2-aza-analogues with activated alkines are frontier orbital controlled whereas protonation is charge controlled. 相似文献
993.
The nucleon decay of the photoresonance in 13C is analyzed using bound-state shell model and R-matrix theory. Total and partial photo cross sections, branching ratios, final state population, and nucleon emission spectra are considered and compared with available data. 相似文献
994.
Günter Haufe Manfred Mühlstädt Dr. Jürgen Graefe 《Monatshefte für Chemie / Chemical Monthly》1976,107(3):653-661
The reactions of (Z)- and (E)-cyclododecene with N-bromosuccinimide in the presence of water, methanol or acetic acid, are described. In every case,trans-1,2-addition is observed. Whereas hydroxybromination and methoxybromination result in the formation of 2-bromocyclododecanol, and 2-bromo-1-methoxycyclododecane, resp., acetoxybromination gives 1-acetoxy-2-bromocyclododecane in addition to 2,2-dibromodicyclododecylether.
Aus der Dissertation zur Promotion A,G. Haufe, Karl-Marx-Universität Leipzig, 1975. 相似文献
Aus der Dissertation zur Promotion A,G. Haufe, Karl-Marx-Universität Leipzig, 1975. 相似文献
995.
The reorientation effect in Coulomb excitation has been used to measure the following static quadrupole moments: . Interference effects from higher excited states have been included in the analysis, with the signs of the E2 matrix elements taken from an anharmonic model. The value obtained for is in disagreement with two previous measurements. We attribute the discrepancy to the smaller internucleon separation distances involved in the previous experiments, which can cause deviations from Coulomb excitation cross sections. The other quadrupole moments have not been measured previously. The B (E2: 0+ → 2+) measured were: . From the angular distribution of the de-excitation γ-rays of the Pb nuclei following recoil into vacuum, we have determined the following (two standard deviations), . Our value of is in agreement with a previous measurement. 相似文献
996.
997.
998.
It is shown that a previously described method for measuring the spin resonance of free electrons in a trap can also be used to measure their (g-2) anomaly. The electrons are trapped in an electrostatic quadrupole field with a superimposed homogeneous axial magnetic field, and are polarized by spin exchange. The spin and (g-2) resonance are monitored through the spin dependence of the excitation processe+Na (3S)→e+Na(3P). Calculations are made of the energy levels and transition probabilities of the trapped electrons. 相似文献
999.
The 488 nm radiation of an argon laser is scattered quasi-elastically at the [0001]-face (basal plane) of a growing ice crystal. The scattering plane is the basal plane. The Rayleigh-linewidth is proportional to the square of the scattering vector. One measures about 2 krad/s at a scattering angle of 90°. The linewidth does not depend on the growth rate. Scattering is only observed once a critical growth rate νcrit = 1,5 μ m?s has been exceeded. Then the scattering intensity depends linearly on the growth rate in the range between 0,03 μ m?s and 2,5 μ m?s. Once the surface is molten scattering vanishes and does not reappear until the growth rate has again exceeded the threshold νcrit. The coherence properties of the scattered light indicate that the thickness of the scattering layer is less than 6 μ m. The observations are interpreted in terms of a fluctuating interface. The decay time of the fluctuations has been calculated. Satisfactory agreement with the observed Rayleigh linewidth is obtained. 相似文献
1000.
A thermally stimulated depolarisation peak from a MgO single crystal shows a peculiar response to sequences of poling conditions. A field induced mechanical relaxation which fixes (or frees) an anisotropic defect dipole is suggested. 相似文献