974 resultados para (H2S HS- S2-)
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[Carl Oestreich]
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Vorbesitzer: Freiherrlich Carl von Rothschild'sche Bibliothek Frankfurt am Main; Akzessionsnummer: x18722; Bemerkung: Mae ohne Passepartout
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We observe the weak S 0 S 2 transitions of the T-shaped benzene dimers (Bz)2 and (Bz-d 6)2 about 250 cm1 and 220 cm1 above their respective S 0 S 1 electronic origins using two-color resonant two-photon ionization spectroscopy. Spin-component scaled (SCS) second-order approximate coupled-cluster (CC2) calculations predict that for the tipped T-shaped geometry, the S 0 S 2 electronic oscillator strength f el (S 2) is 10 times smaller than f el (S 1) and the S 2 state lies 240 cm1 above S 1, in excellent agreement with experiment. The S 0 S 1 ( ) transition is mainly localized on the stem benzene, with a minor stem cap charge-transfer contribution; the S 0 S 2 transition is mainly localized on the cap benzene. The orbitals, electronic oscillator strengths f el (S 1) and f el (S 2), and transition frequencies depend strongly on the tipping angle between the two Bz moieties. The SCS-CC2 calculated S 1 and S 2 excitation energies at different T-shaped, stacked-parallel and parallel-displaced stationary points of the (Bz)2 ground-state surface allow to construct approximate S 1 and S 2 potential energy surfaces and reveal their relation to the excimer states at the stacked-parallel geometry. The f el (S 1) and f el (S 2) transition dipole moments at the C 2v -symmetric T-shape, parallel-displaced and stacked-parallel geometries are either zero or 10 times smaller than at the tipped T-shaped geometry. This unusual property of the S 0 S 1 and S 0 S 2 transition-dipole moment surfaces of (Bz)2 restricts its observation by electronic spectroscopy to the tipped and tilted T-shaped geometries; the other ground-state geometries are impossible or extremely difficult to observe. The S 0 S 1/S 2 spectra of (Bz)2 are compared to those of imidazole (Bz)2, which has a rigid triangular structure with a tilted (Bz)2 subunit. The S 0 S 1/ S 2 transitions of imidazole-(benzene)2 lie at similar energies as those of (Bz)2, confirming our assignment of the (Bz)2 S 0 S 2 transition.
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BACKGROUND Pemphigus encompasses a group of life-threatening autoimmune bullous diseases characterized by blisters and erosions of the mucous membranes and skin. Before the era of immunosuppressive treatment, the prognosis of pemphigus was almost fatal. Due to its rarity, only few prospective controlled therapeutic trials are available. OBJECTIVES For this reason, a group of European dermatologists with a long-standing interest and expertise in basic and clinical pemphigus research has sought to define diagnostic and therapeutic guidelines for the management of patients with pemphigus. RESULTS This group identified the statements of major agreement or disagreement regarding the diagnostic and therapeutic management of pemphigus. The revised final version of the pemphigus guideline was finally passed on to the European Dermatology Forum (EDF) for a final consensus with the European Academy of Dermatology and Venereology (EADV) and the European Union of Medical Specialists (UEMS).
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Vorbesitzer: Dr. H. Henkel; Freiherrlich Carl von Rothschild'sche Bibliothek Frankfurt am Main (Bibliothek fr Neuere Sprachen und Musik, Frankfurt am Main); alte Signatur: Hs in 4 35; Akzessionsnummer: 20229
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Vorbesitzer: Adlade de Rothschild; Freiherrlich Carl von Rothschild'sche Bibliothek Frankfurt am Main; alte Signatur: 81; Hs in 4 37; Akzessionsnummer: X19125
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Vorbesitzer: Adlade de Rothschild; Freiherrlich Carl von Rothschild'sche Bibliothek Frankfurt am Main; alte Signatur: 82; Hs in 4 38; Akzessionsnummer: X19126
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Vorbesitzer: Freiherrlich Carl von Rothschild'sche Bibliothek Frankfurt am Main; Akzessionsnummer: x18722; Bemerkung: Mae ohne Passepartout
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Comets are thought to be the most pristine bodies present in the Solar System. In consequence of spending the majority of their existence beyond 30 AU, their composition can give insights on the physical and chemical conditions during their formation. Since August 2014 the European Space Agency spacecraft Rosetta accompanies the Jupiter family comet 67P/Churyumov-Gerasimenko on its way to perihelion and beyond. In this study the isotope fractionation of 34S are reported in H2S, OCS, SO2, S2, and CS2 at 67P. In addition for the first time the isotope fractionation for 33S is presented for cometary volatiles. The ratio 32S/33S is given for H2S, SO2 and a tentative value is given for CS2. With a mean value of -50 22 and -306 31 for 34S and 33S respectively, H2S shows a significant depletion in both 34S and 33S. For SO2 the depletion is less distinct with 34S and 33S being -67 40 and -130 53, respectively. The strongest depletion is present for CS2 with -114 21and -276 55, respectively. For OCS and S2 only 34S could be determined which is -252 77 and -357 145, respectively. A comparison with sulfur isotopic ratios measured in SiC grains revealed that both SiC grains and the five volatile species have similar sulfur isotopic ratios. However, it is beyond the scope of this work to investigate the possibility of a link between SiC grains and cometary ices. Nevertheless, mass-dependent or mass-independent fractionation due to photo dissociation can be ruled out as sole cause of the seen depletion of 33S and 34S. Furthermore, an upper limit of (9.64 0.19)10.4 for D/H in HDS has been determined. This value is about a factor two higher than D/H in H2O for the same comet reported by (Altwegg et al., 2015). Besides the investigation concerning isotopic ratios of sulfur bearing species in this work the calibration and characterization of ROSINA/DFMS has been continued. Here it is reported about the deviation of the mass scale for MCP/LEDA low resolution spectra and the calibration measurements performed in the laboratory. Furthermore the outcome of the attempt to describe the sensitivity of DFMS with an empirical function will be discussed. The last part of the characterization of DFMS is dedicated to determine the so-called individual pixel gain for the laboratory and the flight model. Moreover, correlation between the depletions manifestation of the MCP with respect to the applied voltages has been investigated for both models. It has been found that further measurements are needed to understand the manifestation of depletion at the laboratory model. For the model on board of Rosetta it could be shown that most of the present feature are due to the usage of the MCP and suggestions have been made in order to answer the remaining question considering the depletion of the MCP.
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Musik von Carl Maria von Weber. Gedicht von Friedrich Kind. Nach Friedrich Kinds Jubel Cantate gedichtet von A. Wendt
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Richard James Horatio Gottheil
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Josef ben Abraham ben Zeiach
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Moses ben Jakob Chaggis
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J. Stockhausen. [Melodie von Franz Schubert]
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J. St.
