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121.
Bräuning H Mokler PH Liesen D Bosch F Franzke B Krämer A Kozhuharov C Ludziejewski T Ma X Nolden F Steck M Stöhlker T Dunford RW Kanter EP Bednarz G Warczak A Stachura Z Tribedi L Kambara T Dauvergne D Kirsch R Cohen C 《Physical review letters》2001,86(6):991-994
Strong evidence has been found for enhanced multiple electron capture into 46 MeV/u Pb81+ with a significant contribution from the entrance surface of thin carbon foils. Capture of up to five electrons has been observed. The multiple electron capture yield is found to increase with decreasing target thickness for thin targets. A simple model describing the data and showing the importance of capture from surfaces is discussed. Further evidence is found for a pronounced asymmetry between electron capture at the entrance and the exit surfaces. Absolute yields for multiple electron capture and projectile ionization are presented. The experimental total cross sections for single capture and ionization agree well with theory. 相似文献
122.
Beilmann C Mokler PH Bernitt S Keitel CH Ullrich J López-Urrutia JR Harman Z 《Physical review letters》2011,107(14):143201
Intershell higher-order (HO) electronic recombination is reported for highly charged Ar, Fe, and Kr ions, where simultaneous excitation of one K-shell electron and one or two additional L-shell electrons occurs upon resonant capture of a free electron. For the mid-Z region, HO resonance strengths grow unexpectedly strong with decreasing atomic number Z (∝Z(-4)), such that, for Ar ions the 2nd-order overwhelms the 1st-order resonant recombination considerably. The experimental findings are confirmed by multiconfiguration Dirac-Fock calculations including hitherto neglected excitation pathways. 相似文献
123.
C. E. Koning R. Fayt W. Bruls L.v.D. Vondervoort T. Rauch PH. Teyssi 《Macromolecular Symposia》1993,75(1):159-166
The compatibilization and impact modification of blends of a relatively new engineering plastic polyamide 4.6 (PA 4.6) and a poly(aryl ether sulfone) (PSU) are investigated. PSU-b-PA6 block copolymers, which can be easily synthesized by ring opening polymerization of ϵ-caprolactam in the presence of a commercial PSU, were found to be very efficient emulsifiers for these incompatible blends. Small amounts (1–4%) of copolymer are sufficient to significantly reduce the particle size and to improve the tensile and impact properties. Combinations of the copolymer and an impact modifier (ethylene-propylene rubber grafted with maleic anhydride) are synergistic and high impact PSU/PA 4.6 alloys are obtained in that way. 相似文献
124.
PH. Teyssi R. Fayt J. P. Hautekeer C. Jacobs R. Jrme L. Leemans S. K. Varshney 《Macromolecular Symposia》1990,32(1):61-73
The living low temperature polymerization in polar solvents of most methacrylates, even functional ones, can now be performed by direct and experimentally convenient anionic methods, thanks to the use of α-methylstyrene and of complex-purified monomers. A diversified family of block copolymers has thus been generated, that are used as compatibilizing agents in the designing of interesting heterophase materials: i.e. blends of polymers and inorganic fillers, and liquid-solid dispersions. The living polymerization of acrylates (or of methacrylates under more drastic conditions) raises additional requirements: they have been met to a large extent by the use of specific ligands of the growing ion-pair. Resulting structures such as f.i. block copolymers and end-functionalized oligomers of a low dispersity, should have a great interest in the molecular engineering of (meth)acrylate-based products. Finally, these new initiators lend themselves to structural and mechanistic studies which should shed some light on the critical features of these living propagation processes. 相似文献
125.
126.
J. BLANC V. BONACIC-KOUTECKY M. BROYER J. CHEVALEYRE PH. DUGOURD J. KOUTECKY C. SCHEUCH J. P. WOLF L. WOESTE 《ChemInform》1992,23(17):no-no
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option. 相似文献