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The mean field equations of the simple cubic or tetragonal ANNNI model are studied on finite lattices. Structure combination branching processes are found which allow us to considerably refine previous mean field calculations on the model. 相似文献
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We describe a mid-infrared spectrometer that is based on the combination of a multiple-pass absorption cell and a submicrosecond pulsed quantum-cascade laser. The spectrometer is capable of both making sensitive measurements and providing a real-time display of the spectral fingerprint of molecular vapors. For a cell with a path length of 9.6 m, dilution measurements made of the nu9 band transitions of 1,1-difluoroethylene indicate a sensitivity of 500 parts in 10(9), corresponding to a fractional absorbance of 4 x 10(-4). 相似文献
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Duxbury G McPhail MJ Smith KM Nivellini G Tullini F Celli A 《Journal of Molecular Spectroscopy》2000,199(1):13-17
High-resolution FTIR spectra of 1,1,1-trifluoroethane (HFC-143a) have been recorded in the region from 1370 to 1470 cm(-1) with an unapodized resolution of 0.0016 cm(-1) at room temperature and of 0.004 cm(-1) at 183 and 100 K. The two main infrared active bands of A(1) symmetry have been shown to be nu(2) at 1407.5 cm(-1) and nu(4) + nu(5) at 1440.5 cm(-1). With the aid of Raman spectra, the two infrared inactive bands of E symmetry in this spectra region have been shown to be nu(8) at 1457.5 cm(-1) and nu(6) + nu(9) at 1446.2 cm(-1). The nu(2) band was analyzed as an isolated band, whereas the nu(4) + nu(5) band was analyzed as part of the triad nu(4) + nu(5), nu(6) + nu(9), and nu(8). Copyright 2000 Academic Press. 相似文献
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The ν5 band of 12CD3F was studied using coincidences with the 9.4-μm band of the 12C16O2 laser and the 9.25-μm band of the 12C18O2 laser. The resonances were analyzed together with the infrared spectra and recent microwave results to give the following vibration-rotation parameters and dipole moment in the ν5 state: ν0 = 1072.35093 (11) cm?1; B = 0.681137 (4) cm?1; A5-A0 = ?0.01437 (3) cm?1; Aζz = ?0.81453 (3) cm?1; μν5 = 1.8751 (25) D. The parameters should be useful in assigning some near millimeter laser lines in CD3F. 相似文献
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Alan R. Kennedy Dr. Prokopis C. Andrikopoulos Dr. Jean‐Baptiste Arlin David R. Armstrong Dr. Neil Duxbury David V. Graham Jennifer B. A. Kirkhouse Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(37):9494-9504
The first solid‐state structures of ortho‐sulfonated monoazo dyestuffs are reported and compared to those of their para‐ and meta‐sulfonated analogues. The structures of the 16 Na, K, Cs, Mg, Ca, Sr, and Ba ortho‐sulfonated salts are found to have fewer M? O3S bonds than their isomeric equivalents and this in turn means that the metal type is no longer the prime indicator of which structural type will be adopted. M? O3S bonds are replaced by M? OH2, M? HOR and M–π interactions, apparently for steric reasons. As well as new bonding motifs, the changed dye shape also leads to new packing motifs. The simple organic/inorganic layering ubiquitous to the para‐ and meta‐sulfonated dye salt structures is replaced by variations (organic bilayers, inorganic channels), each of which correlates with a different degree of molecular planarity in the sulfonated azo dye anion. 相似文献
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