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The properties of acoustic plasmon excitations and the conditions for their existence in a metal with two overlapping bands one of which is narrow (d-band) and the other broad (s-band) are discussed. Model calculations in which the d-electrons are treated in the tight-binding approximation and the s-electrons are assumed to be free are presented. The prospects for finding well defined acoustic plasmons in a real system are examined. The example of the V3Ga crystal is considered in some detail. 相似文献
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Formation of ions in chemical ionization mass spectrometry of flavonoid compounds has been studied. Production of adduct ions and fragment ions as a function of ring substituents and of reagent gas has been observed. Pressure and repeller field dependence of ions has been found as a function of ring substituents. 相似文献
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R. M. Sandstedt W. J. Eva W. F. Geddes B. Frisell M. J. Blish M. M. Rainess A. I. Krupkin L. Reimers L. Karácsonyi E. Unna D. K. Mecham C. E. Bode C. O. Swanson E. Munz C. H. Bailey L. H. Bailey Fr. Láska B. Rund P. A. Wawilin B. I. Rudoschewskaja G. A. Weiss A. L. Schinkarenko W. A. Ignatowitsch P. Glassmann J. Kantorer W. Whale 《Analytical and bioanalytical chemistry》1939,116(7-8):256-261
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Issachar Unna 《Physics in Perspective (PIP)》2000,2(4):336-380
The creation of a good physics department in the newly established Hebrew University in Jerusalem (opened in 1925) was an
important goal for Chaim Weizmann, President of the Zionist Organization and founder of the University (and chemist, by profession).
A. H. Fraenkel, the mathematician, and L. S. Ornstein, the physicist from Utrecht, invested a lot of effort in achieving this
goal. Albert Einstein was consulted on an almost day-to-day basis. Serious attempts were made to bring a first-rate theoretician
to Jerusalem. After 1933, the chances for getting such a physicist were actually very good. George Placzek worked in Jerusalem
during the academic year 1934–1935. Felix Bloch, Eugene Wigner, and Fritz London were offered positions as theoretical physicists
in Jerusalem and considered the offers favorably. The discussions and correspondence with these great physicists are illuminating.
Budget limitations, the problem of the teaching language (Hebrew) and the seclusion of Jerusalem from science centers in Europe
or the United States undermined all these efforts. A solution was found when Giulio Racah from Italy finally was appointed. 相似文献
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