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61.
Alves GA Amato S Anjos JC Appel JA Astorga J Bernard T Bracker SB Cremaldi LM Darling CL Dixon RL Errede D Gay C Green DR Jedicke R Karchin PE Kwan S Lueking LJ de Mello Neto JR Metheny J Milburn RH de Miranda JM da Motta Filho H Napier A Passmore D Rafatian A dos Reis AC Ross WR Santoro AF Sheaff M Souza MH Spalding WJ Stoughton C Streetman ME Summers DJ Takach SF Wallace A Wu Z 《Physical review letters》1994,72(6):812-815
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Synthesis and Structures of Vanadium(III) and Vanadium(IV) Silanolates The syntheses of the new and partially known vanadium(III)-silanolate complexes [{V(OSiMet2Bu)3}2(THF)] ( 1 ), [Li(THF)2V(OSiMet2Bu)4] ( 2 ), [V(OSiMet2Bu)(lut)] ( 3 ), V(OSiPh3)3(THF)3 ( 4 ), [Li(THF)4][V(OSiPh3)4](THF)2 ( 5 ), [Li(DME)VMes(OSiMet2Bu)3] ( 7 ), [Li(THF)4][VMes · (OSiPh3)3] ( 8 ), [Li(THF)4][VMes3(OSiMet2Bu)] ( 9 ), and Na[VMes3(OSiPh3)](THF)4 ( 10 ) as well as the vanadium(IV) compounds [V(OSiPh3)4] ( 6 ), [VMes3(OSiMet2Bu)] ( 11 ) and [VMes3(OSiPh3)] ( 12 ) are reported. In most cases the vanadium atom displays a coordination number of four. The dimeric structure of 1 with coordination numbers of four and five, respectively, has been deduced from molecular mass measurements, mass spectrometry and its magnetic properties. The crystal structures of compounds 2 , 4 , 5 , 9 and 11 were resolved. Complex 2 resembles a bridged contact ion pair in which both metal centres are in a tetrahedral coordination environment. In 4 the ligands are arranged trigonal bipyramidally with the THF molecules in the axial positions. Complexes 5 and 9 crystallize in separated ion paires with the vanadium in a tetrahedral coordination sphere. The crystal structure of 11 is analogous to that of 9 but with consequences due to the higher oxidation state. Oxidation of the vanadates(III), e. g. 5 , 9 and 10 , yields the corresponding vanadium(IV) compounds 6 , 11 and 12 . 相似文献
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Peters Rost Haussmann Mayer P. Kulisch und Allihn 《Fresenius' Journal of Analytical Chemistry》1900,39(6):370-371
Ohne Zusammenfassung 相似文献
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We present a theoretical analysis of high-order harmonic generation from ion-atom collisions in the presence of linearly polarized intense laser pulses. Photons with frequencies significantly higher than in standard atomic high-harmonic generation are emitted. These harmonics are due to two different mechanisms: (i) collisional electron capture and subsequent laser-driven transfer of an electron between projectile and target atom; (ii) reflection of a laser-driven electron from the projectile leading to recombination at the parent atom. 相似文献
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Czasch A Schöffler M Hattass M Schössler S Jahnke T Weber T Staudte A Titze J Wimmer C Kammer S Weckenbrock M Voss S Grisenti RE Jagutzki O Schmidt LP Schmidt-Böcking H Dörner R Rost JM Schneider T Liu CN Bray I Kheifets AS Bartschat K 《Physical review letters》2005,95(24):243003
Partial photoionization cross sections sigmaN(Egamma) and photoelectron angular distributions betaN(Egamma) were measured for the final ionic states He+ (N > 4) in the region between the N = 8 and N = 13 thresholds (Egamma > 78.155 eV) using the cold target recoil ion momentum spectroscopy technique (COLTRIMS). Comparison of the experimental data with two independent sets of theoretical predictions reveals disagreement for the branching ratios to the various HeN(+) states. The angular distributions just below the double ionization threshold suggest an excitation process for highly excited N states similar to the Wannier mechanism for double ionization. 相似文献
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