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21.
T. Morek H. Beuscher B. Bochev T. Kutsarova R.M. Lieder M. Müller-Veggian A. Neskakis 《Nuclear Physics A》1985,433(2):159-180
The level schemes of the nuclei 134,136La have been studied by means of in-beam γ-ray spectroscopic methods following the (α, 3n) and (p, 3n) reactions. New isomers with half-lives of 29 ± 5 μs and 17 ± 4 ns have been discovered in 134La and 136La, respectively. Low-lying levels and isomers in 134,136La have been interpreted as members of multiplets having configurations. 相似文献
22.
Chemistry of Free Cyclic Vicinal Tricarbonyl Compounds (‘1,2,3‐Triones’). Part 3. Polar and Redox Reactions of 1,2,3‐Triones with Enamines of Different Types – News on Oxonol Dyes, Radicals, and Biradicals The central C?O groups of cyclic 1,2,3‐triones possess outstanding electrophilic (electron‐pair‐accepting) as well as oxidizing (one‐electron‐accepting) properties. Thus, 1,2,3‐triones are chemically related to 1,2‐ and 1,4‐benzoquinones. Whereas polar reactions with carbanion‐like (electron rich) species give rise to nucleophilic addition reactions to C?O groups under exclusive C,C‐bond formation, SET (single‐electron transfer) or redox reactions effect a partial ‘carbonyl Umpolung’ via ketyl intermediates (C,C‐ and/or C,O‐bond formation). Here, we report on numerous reactions between electron‐rich, more‐ or less‐polar enamines with 5,5‐dimethylcyclohexane‐1,2,3‐trione ( 9a ) and 1H‐indene‐1,2,3‐trione ( 9b ). Various new derivatives of basic oxonol dyes were formed, including the first oxonol dye incorporating a 1,3‐dioxocyclohexyl moiety. A novel stable radical, 50 / 50′ , was obtained from 9b and 11a via addition, hydrolysis, and treatment with conc. H2SO4. Radical 50 / 50′ represents a vinylogous ‘monodehydroreductone’ and is, thus, related to monodehydroascorbic acid ( 143 ), to Russell's radical cation ( 144 ), to indigo ( 141 / 141′ ), and to quinhydrone. 相似文献
23.
T. Morek H. Beuscher B. Bochev D. R. Haenni R. M. Lieder T. Kutsarova M. Müller-Veggian A. Neskakis 《Zeitschrift für Physik A Hadrons and Nuclei》1980,298(4):267-271
Several new levels including two isomeric states have been established in134Ba. Spin and parity assignments of 10+ and 5? are proposed for the isomers. The former may have a \(\left( {vh_{1 1/2} } \right)_{10^ + } \) configuration while the latter may be either \((vs_{{1 \mathord{\left/ {\vphantom {1 2}} \right. \kern-0em} 2}} vh_{{{11} \mathord{\left/ {\vphantom {{11} 2}} \right. \kern-0em} 2}} )_{5 - } \) or \(\left( {vd_{3/2} vh_{1 1/2} } \right)_{5^ - } \) . 相似文献
24.
Kurt Schank Stpehan Bügler Robert Lieder Norbert Schott 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1-4)
Abstract Phosphorus (III) componds like 1 possess basic and nucleophilic properties (phosphonium salt formation) as well as SET properties (i.e. reduction of peroxides). Typical examples of both reaction types are discussed in schemes I and II. 相似文献
25.
Stable isotope methods are potentially quite useful for validating natural or enhanced mineral degradation of contaminants. For this reason, a continuous flow gas chromatograph (GC), isotope ratio mass spectrometer (IRMS) has been coupled with a quadrupole mass selective detector (MSD) to allow simultaneous mass spectral and stable carbon isotope ratio data to be obtained from a single chromatographic analysis. This allows the target contaminant and any extra-cellular degradation intermediates to be both qualified and quantified. Previously acceptable limits of precision (0.3 parts per mil) are undesirable given the small fractionation observed during aerobic degradation. To further understand the fate of organic contaminants and to gain information about the metabolic degradative pathway employed by a microorganism, routine isotopic analyses on a range of analytes have been performed. Quantities of sample producing mass-44 ion beam signal (I(44)) of 2 x 10(-10) to 1 x 10(-8) A were analysed. When the IRMS was tuned for high sensitivity, ion source nonlinearities were overcome by peak height correction from an algorithm that was produced using known isotopic standards of varying concentrations. This led to sample accuracy of <0.01 per thousand and sample precision of 0.1 per thousand. Copyright 1999 John Wiley & Sons, Ltd. 相似文献
26.
UP Schlunegger M Stoeckli RM Caprioli 《Rapid communications in mass spectrometry : RCM》1999,13(18):1792-1796
An ion trap has been modified for the analysis of high mass ions generated by matrix-assisted laser desorption/ionization. Samples are deposited on a probe tip and introduced directly onto the hyperbolically shaped surface of one endcap. All three electrodes - both the endcaps and the ring electrode - are insulated so that the radio frequency (Rf) voltage may be applied to the center ring electrode and the inverted Rf voltage to the endcaps. By using low frequencies (below 100 kHz) and low amplitudes (below 200 V), high mass singly charged ions may be trapped and analyzed by a frequency sweep at constant amplitude. In the high mass range (60-160 kDa), this instrument showed good sensitivity, signal-to-noise ratios, and mass resolution. Copyright 1999 John Wiley & Sons, Ltd. 相似文献
27.
28.
M. Piiparinen A. Ataç G. de Angelis S. Forbes N. Gjørup G. Hageman B. Herskind F. Ingebretsen H. Jensen D. Jerrestam H. Kusakari R. Lieder G. M. Marti S. Mullins J. Nyberg A. Santonocito H. Schnare G. Sletten K. Strahle M. Sugawara P. O. Tjøm A. Virtanen R. Wadsworth 《Zeitschrift für Physik A Hadrons and Nuclei》1992,343(3):367-368
The level scheme of 143 Eu has been extended to I=75/2 in an experiment with the NORDBALL Compton-suppressed Ge detector array and the 110 Pd(37 Cl, 4n) reaction. Most of the scheme shows irregular structure of multiparticle excitations. A strongly populated straight cascade of more than 10 stretched E2 transitions suggests the onset of collectivity. 相似文献
29.
A. Neskakis R.M. Lieder H. Beuscher Y. Gono D.R. Haenni M. Müller-Veggian C. Mayer-Böricke 《Physics letters. [Part B]》1979,80(3):194-197
Two rotation-aligned bands based on an (11)? isomer and a (12)? state, respectively, were observed in 190, 192, 194Au. They have most probably configurations in agreement with recent theoretical predictions in the framework of the triaxial-rotor-plus-particle model. 相似文献
30.
H. Beuscher P. Jahn R. M. Lieder C. Mayer-Böricke 《Zeitschrift für Physik A Hadrons and Nuclei》1971,247(5):383-399
The decay191Hg→191Au was investigated by measuring γ-ray spectra, conversion electron spectra, and coincidence spectra, as well as lifetimes in the second region. The parent isotope191Hg was produced by the reaction197Au (d, 8n) withE d =80 MeV. About 80 γ-transitions of this decay were observed. Multipolarities of the more intense transitions were determined. An isomeric state of 0.92±0.11 s half-life was found in191Au. A level scheme for191Au is suggested. The measured γ-transitions are attributed to the decay of a 13/2+ isomeric state of191Hg; its half-life was found to be 50.8 ±1.5 min. The core excitation model was used to discuss some features of the level structure in191Au. 相似文献