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In this paper we present the dependency of a quantitative measurement of the first-order longitudinal mode beating of an injection-seeded optical parametric oscillator (OPO) on its injection-seeding state. We show the correlation of the intensity of the first-order longitudinal mode beating and the side-mode suppression of an injection-seeded OPO. We further demonstrate that the mode-beating intensity can be used as an indicator for the spectral purity of an injection-seeded OPO. 相似文献
14.
Jens Mahnke Delia Bugnariu Frank Ruthe Peter G. Jones 《Phosphorus, sulfur, and silicon and the related elements》2014,189(7-8):963-976
AbstractThe formation and decomposition of P-tellurium-substituted phosphaalkenes was followed by 31P- and 125Te-NMR spectroscopy. Acyclic compounds with C?P-Te moieties are in general thermally labile, but bulky substituents enhance the lifetime of a number of species. The P-chlorophosphaalkene (Me3Si)2C?PCl (1a) reacts with the disilyltelluride (iPrMe2Si)2Te (2) leading to the mixed-substituted telluride (Me3Si)2C?PTeSiMe2iPr 3a which reacts with another equivalent of 1a furnishing the tellurobis(phosphaalkene) [(Me3Si)2C?P]2Te (4a). 4a is a shortlived compound decomposing thermally with precipitation of elemental tellurium, leading to a known diphosphabicyclobutane 5a. In a similar way, the bulkier P-chlorophosphaalkene (iPrMe2Si)2C?PCl (1b) reacts with (iPrMe3Si)2Te furnishing [(iPrMe2Si)2C?P]2Te (4b), which loses tellurium much more slowly than 4a and can be kept in cold solutions for an extended time. Reactions of in situ-prepared lithium aryltellurolates LiTeAr 6 – 9 [Ar?Ph: 6, Ar?2,4,6-Me3Ph (?Mes): 7, Ar?2,4,6-iPr3Ph (?TIP): 8, Ar?2,4,6-tBu3Ph (?Mes*): 9] with 1a provide P-aryltellurophosphaalkenes 10 – 13, which decompose with the loss of diarylditellurides leading to 5a. After a 2 + 4 cycloaddition trapping experiment of 12 with cyclopentadiene, a metastable P-aryltelluro phosphanorbornene 14 was detected by 31P-NMR. Reactions of elemental tellurium with P-phosphanylphosphaalkenes (Me3Si)2C?PPR′R′;′ 15 – 17 (R′, R′′?iPr: 15; R′?iPr, R′′?tBu: 16; R′, R′′?tBu: 17) lead to metastable insertion products (Me3Si)2C?PTePR′R′′ 18 – 20 that decompose with formation of the tellurobisphosphanes (R′R′′P)2Te 21 – 23, and of the bicyclic diphosphane 5a, which isomerises thermally to the diphosphabicyclooctane 24. The P-di-i-propylphosphanyl-phosphanorbornene 25 dismutates under the action of tellurium into the symmetric diphosphanes iPr4P2 and bis-phosphanorbornene 26. The tellurium-free products 24 and 26 were characterized by X-ray crystallography. 相似文献
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The electric field gradient of T1 in Bi has been determined with the PAD method. The observed value follows the general trend of sp-probe atoms in the group V semimetals in accordance with a covalent bond picture. 相似文献
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The magnetic moments of the 12+ isomers in 192, 196, 198, 200, 206Pb and of the isomer in 205Pb have been measured using the PAD technique. The results for the g-factors are: g(192) = ?0.173(2), g(196) = ?0.1600(15), g(198) = ?0.1552(15), g(200) = ?0.1512(15), g(206) = ?0.1496(18), and g(205) = ?0.148(5). As all states have a rather pure configuration, the values reflect directly the orbital. They show a decrease towards the more neutron-deficient isotopes attributed to the reduced core polarisation as a result of decreasing occupation of the neutron shell. The measured systematics are discussed regarding core polarisation, mesonic corrections, and small admixtures of core-excited states to the wave function. 相似文献
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Dr. Ulrike Warzok Lisa K. Mahnke Prof. Dr. Wolfgang Bensch 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(6):1405-1419
Polyoxometalates (POMs) are an intriguing class of compounds due to their tremendous structural variety and the wide spectrum of resulting properties, which make them interesting for applications in fields such as catalysis, material science or nanotechnology. Their ability to form large supramolecular architectures by self-assembly offers an entry to complex, functional systems. After an introduction into the structure and synthesis of POMs of the early transition metals, recently discovered water-soluble antimonato polyoxovanadates (Sb-POVs) and the investigation of their chemical reactivity are discussed. Electrospray ionization mass spectrometry (ESI-MS) is presented as an analytical technique suitable to investigate the structure of complex POM assemblies in solution and to probe the underlying reactivity and formation mechanisms. This Minireview highlights the first studies on the soluble Sb-POVs and how the knowledge of their reactivity obtained by ESI-MS has fostered the syntheses of numerous novel Sb-POV compounds. 相似文献
19.
The electric field gradient of Sb in Cd was determined by a PAD measurement on112Sb recoil-implanted into a Cd single crystal. We observe an extremely small value compared with known values on the probes Cd, In, and Sn in a Cd matrix. Strong local electronic effects may be responsible for this result. 相似文献
20.
Fedor Mitschke Alexander Hause Christoph Mahnke 《The European physical journal. Special topics》2016,225(13-14):2453-2464
Recent developments in the technology of optical telecommunications are pushed forward by the rapidly growing demand for data-carrying capacity. Current approaches are discussed; most lines of investigation are limited to the linear (i.e. low power) regime. It is shown how this restriction poses a limit for further evolution. If, on the other hand, the nonlinear regime is entered, recent developments about soliton molecules offer a possibility to advance further. 相似文献