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11.
Angelika Jungmann R. Claessen R. Zimmermann Ge Meng P. Steiner S. Hüfner S. Tratzky K. Stöwe H. P. Beck 《Zeitschrift für Physik B Condensed Matter》1995,97(1):25-34
The electronic structure of the layered compounds LaI2 and CeI2 was investigated by photoemission and electron energy loss spectroscopy. From the experimental results we are able to confirm the metallic nature of these compounds, and by using photon energy dependent measurements of the valence band we can identify the orbital character of the conduction band as essentially 5d1-like. A detailed analysis of the Ce 3d and 4f spectra yields a remarkably small 4f-5d hybridization strength, almost completely decoupling the f-electron from the conduction band, which makes CeI2 a somewhat unusual system compared to other metallic Ce compounds. Band structure calculations by Jepsen and Andersen [1] confirm these experimental results. 相似文献
12.
H. -G. Clerc W. Lang H. Wohlfarth K. -H. Schmidt H. Schrader K. E. Pferdekämper R. Jungmann 《Zeitschrift für Physik A Hadrons and Nuclei》1975,274(3):203-213
The mass separated fission product beam provided by the mass separator “Lohengrin” has been used to determine the nuclear charge distribution for the thermal-neutron-induced fission of235U for all light fission products in the region 80≦A≦107. The measurements were performed at the most probable kinetic energy of the fission products. By using the known fission product mass yields, the independent yields for a total number of 100 nuclides were obtained under the condition of the most probable kinetic energy. The proton pairing effect modulates the average nuclear charge of the fission fragments and the isobaric charge distribution widths in a regular fashion. The probabilities of breaking a pair and of forming fragments with an energetically unfavourable neutron-to-proton ratio are found to compete with each other. Both probabilities depend on the mass split and reach their maximum values in the region of the most probable masses. The odd-even-proton effect is found to vary smoothly between 16% for the most abundant mass splits and 40% for the rare mass splits. The odd-even-neutron effect exhibits maxima nearN=50 andN=60, where it reaches 16%. These maxima and the extremely low Tcyield (0.13±0.05%) are discussed with regard to fragment shell effects. 相似文献
13.
14.
A. Grün C. Jungmann C. Stiepel Herm Stadlinger und Maurice François 《Fresenius' Journal of Analytical Chemistry》1918,57(3):145-147
Ohne Zusammenfassung 相似文献
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16.
P. Steiner S. Hüfner A. Jungmann V. Kinsinger I. Sander 《Zeitschrift für Physik B Condensed Matter》1989,74(2):173-182
Photoemission valence band spectra with three different photon energies (21.2 eV, 40.8 eV, 1253.6 eV) for Cu2O and CuO and a number of copper oxide based superconducting ceramics are investigated, namely La2CuO4 (LCO), Y1Ba2Cu3O7 (YBCO), Bi2Sr2CaCu2O8 (BSCCO) and Tl2Ba2Ca2Cu3O10 (TBCCO). From the Cu2O data it can be infered, that the He-II (40.8 eV) spectra give a fair representation of the density of states (DOS). In addition the agreement between the calculated density of states (DOS) and the He-II photoemission spectrum is almost perfect for Cu2O. This agreement is worse for CuO and the other materials which all have a Cu groundstate close to a 3d
9 configuration indicating a large contribution of thed-d correlation energy to the excitation spectra which is absent in Cu2O because of the filled 3d-shell. In all cases the experimental DOS atE
F is very small and only the spectra of BSCCO show a well defined Fermi edge. The relevance of these findings with respect to the theoretical local functional density DOS calculations is discussed. 相似文献
17.
K. A. Woodle K. -P. Arnold M. Gladisch J. Hofmann M. Janousch K. P. Jungmann H. -J. Mundinger G. zu Putlitz J. Rosenkranz W. Schäfer G. Schiff W. Schwarz V. W. Hughes S. H. Kettell 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1988,9(1):59-64
We report the first measurement of the polarization of thermal muonium in vacuum. A 20 MeV/c beam of μ+ was stopped in a layer of SiO2 powder which emitted (17±1)% of the stopped μ+ into vacuum as thermal muonium. The muonium Larmor precession was observed in a transverse magnetic field of 1.4 G, and the measured amplitude of the precession signal indicates that the μ+ polarization in the muonium is (39±9)%. 相似文献
18.
Jungmann R Liedl T Sobey TL Shih W Simmel FC 《Journal of the American Chemical Society》2008,130(31):10062-10063
DNA origami is one of the most promising recent developments in DNA self-assembly. It allows for the construction of arbitrary nanoscale patterns and objects by folding a long viral scaffold strand using a large number of short "staple" strands. Assembly is usually accomplished by thermal annealing of the DNA molecules in buffer solution. We here demonstrate that both 2D and 3D origami structures can be assembled isothermally by annealing the DNA strands in denaturing buffer, followed by a controlled reduction of denaturant concentration. This opens up origami assembly for the integration of temperature-sensitive components. 相似文献
19.
P. Bakule P.E.G. Baird M.G. Boshier S.L. Cornish D.F. Heller K. Jungmann I.C. Lane V. Meyer P.H.G. Sandars W.T. Toner M. Towrie J.C. Walling 《Applied physics. B, Lasers and optics》2000,71(1):11-17
A Q-switched alexandrite laser suitable for high-resolution spectroscopy is described which produces pulses of 35 mJ energy in a 10 MHz bandwidth, with a high-purity TEM00 mode. The laser can be synchronised to external event to within 100 ns. The output pulse length is 120 ns and the repetition rate 25 Hz. The laser is injection-seeded by a Ti:sapphire laser operating around 730 nm. To preserve single-mode seeding under external triggering conditions, and to obtain small time-jitter, active cavity length control was used. In order to achieve the 10 MHz output bandwidth, intra-cavity electro-optic modulators were used to compensate for the frequency chirp. The refractive index of alexandrite was found to vary linearly with inversion density with a constant of proportionality equal to 1.6᎒-24 cm3. In pulsed operation at 730 nm, the index change due to this effect is only partially compensated by changes due to ground state phonon relaxation. 相似文献
20.