排序方式: 共有27条查询结果,搜索用时 78 毫秒
1.
B. Pümpin H. Keller W. Kündig I. M. Savić J. W. Schneider H. Simmler P. Zimmermann E. Kaldis S. Rusiecki C. Rossel 《Hyperfine Interactions》1991,63(1-4):25-31
A systematic μSR study of the local magnetic field distribution in a series of oxygen deficient YBa2Cu3O
x
samples with 6.5⩽x⩽7.0 is reported. Special attention was given to perform the experiments under the same conditions, so that the oxygen content
of the measured samples was the only parameter varied. The behavior of the depolarization rate σ as a function of the oxygen
contentx was found to have strong similarities with the behavior of the critical temperatureT
c
as a function ofx. In particular, two step-like increases of σ were observed abovex=6.7 and 6.9. The temperature dependence of the normalized depolarization rate σ(T)/σ(0) is well described by the two-fluid model forx⩾6.781(1) and clearly deviates from this behavior forx⩽6.704(1). Our results are compared to those obtained by other groups. 相似文献
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Ch. Krüger H. Schwer J. Karpinski K. Conder E. Kaldis C. Rossel M. Maciejewski 《无机化学与普通化学杂志》1994,620(11):1932-1936
Structural investigations on powder samples of Y2Ba4Cu7O15–x with different carbonate content have been performed. Powder x-ray Rietveld refinements showed the remarkable influence of carbonate incorporation on the lattice parameters. Most important is the decrease of Tc with increasing carbonate content. We assign these effects to an incorporation of the carbonate ion into the crystal lattice, copper vacancies at the Cu(1) position and a possible misorientation of the copper oxygen single chains. No change of the structure (e. g. superstructure) could be found. 相似文献
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A. Rossel 《Fresenius' Journal of Analytical Chemistry》1892,31(1):692-693
Ohne Zusammenfassung 相似文献
6.
J. Clark H. K. Tompkins M. Höhnel C. Glaser O. Kassner S. Rideal H. J. Bult und Rossel 《Fresenius' Journal of Analytical Chemistry》1895,34(1):593-598
Ohne Zusammenfassung 相似文献
7.
K. T. Flanagan J. Billowes M. L. Bissell I. Budinčević T. E. Cocolios R. P. de Groote S. De Schepper V. N. Fedosseev S. Franchoo R. F. Garcia Ruiz H. Heylen K. M. Lynch B. A. Marsh G. Neyens T. J. Procter R. E. Rossel S. Rothe I. Strashnov H. H. Stroke K. D. A. Wendt 《Hyperfine Interactions》2014,227(1-3):131-137
The ability to study rare isotopes with techniques such as mass spectrometry and laser spectroscopy is often prevented by low production rates and large isobaric contamination. This has necessitated the development of novel beam cleaning techniques that can efficiently isolate the isotope of interest. The Collinear Resonance Ionization Spectroscopy (CRIS) experiment at ISOLDE, achieves this by resonantly ionizing a bunched atom beam in a region of ultra high vacuum. This method is motivated by the need to measure the hyperfine structure and isotope shift at the extremes of isospin where typical production rates drop to 1 atom/s. The technique also offers the ability to purify an ion beam and even select long-lived isomeric states (> 1 ms) from the ground state, which can be subsequently studied by decay spectroscopy or mass spectrometry experiments. This paper will report on the successful commissioning of the CRIS beam line and the recent laser spectroscopy results and laser assisted nuclear decay spectroscopy on the neutron deficient francium isotopes. 相似文献
8.
Jolles A. Makowka O. Wogrinz Folin Shaffer Schulz Fr. N. Falta W. Mátrai G. Long J. H. Bräutigam W. Burghart Bondzyński St. Panck K. Clemens P. Strzyźowski C. Beijerink Bouma J. Rossel O. Pollacci E. Grützner B. Schweissinger O. Hopkins F. Gowland Cole S. W. Neuberg C. Petermann A. 《Analytical and bioanalytical chemistry》1902,41(11):712-716
Analytical and Bioanalytical Chemistry - 相似文献
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Yoshinaga MY Kellermann MY Rossel PE Schubotz F Lipp JS Hinrichs KU 《Rapid communications in mass spectrometry : RCM》2011,25(23):3563-3574
Archaea are ubiquitous and abundant microorganisms on Earth that mediate key global biogeochemical cycles. The headgroup attached to the sn-1 position of the glycerol backbone and the ether-linked isoprenoid lipids are among the diagnostic traits that distinguish Archaea from Bacteria and Eukarya. Over the last 30 years, numerous archaeal lipids have been purified and described in pure cultures. Coupled high-performance liquid chromatography (HPLC) ion-trap mass spectrometry (ITMS) now enables the detection and rapid identification of intact polar lipids in relatively small and complex samples, revealing a wide range of archaeal lipids in natural environments. Although major structural groups have been identified, the lack of a systematic evaluation of MS/MS fragmentation patterns has hindered the characterization of several atypical components that are therefore considered as unknowns. Here, we examined mass spectra resulting from lipid analysis of natural microbial communities using HPLC/electrospray ionization (ESI)-ITMS(n), and depicted the systematics in MS(2) fragmentation of intact archaeal lipids. This report will be particularly useful for environmental scientists interested in a rapid and straightforward characterization of intact archaeal membrane lipids. 相似文献