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Schmidt R Blaich T Elze TW Emling H Freiesleben H Grimm K Henning W Holzmann R Keller JG Klingler H Kulessa R Kratz JV Lambrecht D Lange JS Leifels Y Lubkiewicz E Moore EF Wajda E Prokopowicz W Schütter C Spies H Stelzer K Stroth J Walus W Wollersheim HJ Zinser M Zude E 《Physical review letters》1993,70(12):1767-1770
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In the electron impact mass spectra of azomethines derived from various substituted aromatic aldehydes and diarninodicyanoethene the superposition of two ortho effects concurring with the azomethine group is apparent: one involving the amino group of the diaminodicyanoethene part accounts for the cyclization to [C5H3N4]+ ions and the other involving ortho substituents of the benzylidene part which can interact with the azomethine moiety is responsible for specific fragment ions, suppressing the typical fragmentations of azomethines. The ortho effect was studied for the o-nitro derivative by labelling experiments, analysis of metastable transitions and collisional activation comparing model ions, demonstrating that the specific [M-H2O]+˙ and [C7H5NO2]+˙ ions are the result of cyclization processes. 相似文献
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C. Michel Y. El Masri R. Holzmann M. A. Van Hove J. Vervier 《Zeitschrift für Physik A Hadrons and Nuclei》1980,298(3):213-218
Lifetimes of the first 2+, 4+ and 6+ levels in170W have been measured by the recoil-distance method based on the Doppler effect, using the155Gd (20Ne, 5n)170W reaction. The following conclusions can be drawn from the results: if there are any deviations from the predictions of the rotational model for the lifetimes of the 4+ and 6+ states, they are smaller than 8.5 %; if this model accurately describes the nucleus170W, the intrinsic quadrupole moment of this nucleus is: Q0=5.93±0.06 barns, and its deformation is: β=0.240±0.003. The value of Q0 is compared with the predictions of various calculations for the tungsten isotopes. 相似文献
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We derive via diagrammatic perturbation theory the scaling behavior of the condensate and superfluid mass density of a dilute Bose gas just below the condensation temperature, T(c). Sufficiently below T(c) particle excitations are described by mean field (Bogoliubov). Near T(c), however, mean field fails, and the system undergoes a second order phase transition, rather than first order as predicted by Bogoliubov theory. Both condensation and superfluidity occur at the same T(c), and have similar scaling functions below T(c), but different finite size scaling at T(c) to leading order in the system size. A self-consistent two-loop calculation yields the condensate fraction critical exponent, 2beta approximately 0.66. 相似文献
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Hoefman M Aphecetche L Bacelar JC Delagrange H Descouvemont P Diaz J d'Enterria D van Goethem M Holzmann R Huisman H Kalantar-Nayestanaki N Kugler A Lohner H Marques FM Martinez G Messchendorp JG Ostendorf RW Schadmand S Siemssen RH Simon RS Schutz Y Timmermans R Turrisi R Volkerts M Wagner V Weller H 《Physical review letters》2000,85(7):1404-1407
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The use of amicable sets of eight circulant matrices and four negacyclic matrices to generate orthogonal designs is relatively new. We find all 1841 possible orthogonal designs of order 40 in three variables, using only these new techniques. 相似文献