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Raman and mid-infrared spectroscopic study of geometrically frustrated hydroxyl cobalt halides at room temperature

Liu Xiao-Dong,Meng Dong-Dong,Hagihala Masato,Zheng Xu-Guang,Guo Qi-Xin,

中国物理 B , 2011,


中国物理 B , 1993,
Abstract: Low frequency modes were observed in a series of alkali halides doped with lead after X-irradiation at 77K. The peak positions of the Raman signals are at 34cm-1 for NaCl:Pb2+, 30cm-1 for KCl:Pb2+,28cm-1 for RbCl:Pb2+ and 22cm-1 for KBr:Pb2+. They are assigned to the inelastic light scattering caused by the local vibration of X-i (Pb+) center, which consists of an interstitial halogen ion stabilized by a substitutional ion Pb+ . Polarized Raman measurements and Behavior Typer(BT) analysis show that the symmetry of the X-i (Pb+) center belongs to the point group C3v A structure model of the X-i (Pb+) center is proposed based on the Raman data and the result of BT analysis.
Introduction to microstructured optical fibers  [PDF]
M. Yan
Physics , 2005,
Abstract: This article recounts definition, classification, history, and applications of microstructured optical fibers.
Victoriano,Luis I.;
Boletín de la Sociedad Chilena de Química , 2000, DOI: 10.4067/S0366-16442000000400009
Abstract: the preparation and characterization of 1:1 adducts of silver halides agx (x=cl, br, i) with n,n,n?,n?-tetramethylthiuram monosulfide is reported. the products are characterized by elemental analyses, magnetic measurements and ir-raman spectroscopy. the data are interpreted in terms of a halogen-dibridged structure of d2h symmetry.
Evolution of light trapped by a soliton in a microstructured fiber  [PDF]
S. Hill,C. E. Kuklewicz,U. Leonhardt,F. Koenig
Physics , 2009, DOI: 10.1364/OE.17.013588
Abstract: We observe the dynamics of pulse trapping in a microstructured fiber. Few-cycle pulses create a system of two pulses: a Raman shifting soliton traps a pulse in the normal dispersion regime. When the soliton approaches a wavelength of zero group velocity dispersion the Raman shifting abruptly terminates and the trapped pulse is released. In particular, the trap is less than 4ps long and contains a 1ps pulse. After being released, this pulse asymmetrically expands to more than 10ps. Additionally, there is no disturbance of the trapping dynamics at high input pulse energies as the supercontinuum develops further.
Luis I. Victoriano
Boletín de la Sociedad Chilena de Química , 2000,
Abstract: The preparation and characterization of 1:1 adducts of silver halides AgX (X=Cl, Br, I) with N,N,N’,N’-Tetramethylthiuram Monosulfide is reported. The products are characterized by elemental analyses, magnetic measurements and IR-Raman spectroscopy. The data are interpreted in terms of a halogen-dibridged structure of D2h symmetry. Se informa sobre la preparación y caracterización de aductos 1:1 entre haluros de plata AgX (X=Cl, Br, I) y N,N,N’,N’-Tetrametiltiurano Monosulfuro. Los productos se caracterizan mediante análisis elemental, medidas magnéticas y espectroscopía IR-Raman. Los datos se interpretan en base a estructuras con dos halógenos puente, de simetría D2h.
Photoluminescence of an Yb3+/Al3+-codoped microstructured optical fibre

Xia Chang-Ming,Zhou Gui-Yao,Han Ying,Hou Lan-Tian,

中国物理 B , 2011,
Abstract: An Yb3+/Al3+-codoped microstructured optical fibre is prepared based on photonic crystal fibre technology. The characteristic spectra of preforms and fibres are experimentally investigated. The results show that under a 971 nm excitation, besides the known infrared fluorescence luminescence around 1050 nm, a blue luminescence peak at 486 nm is obtained. Moreover, an unexpected emission peak at 730 nm is also observed. The photoluminescence mechanism of an Yb3+/Al3+-codoped microstructured optical fibre is discussed. The emission peak at 486 nm is attributed to the cooperative upconversion resulting from pairs of Yb3+ ions, and the emission peak around 730 nm is ascribed to the stimulated Raman scattering because of nonlinear effects of microstructured optical fibre. The Yb3+/Al3+-codoped microstructured optical fibre is promising for varieties of applications from laser printing and optical recording to cancer treatments, such as photodynamic therapy.
Superhydrophobicity from microstructured surface
Lijun Zheng,Xuedong Wu,Zeng Lou,Dan Wu
Chinese Science Bulletin , 2004, DOI: 10.1007/BF03183400
Abstract: Superhydrophobicity is referred to the wettability of a solid surface which has a water apparent contact angle greater than 150°. It has attracted great interest in both fundamental researches and practical applications. This paper discusses two models: Wenzel model and Cassie model, to describe the superhydrophobic states of surface. The effects of surface morphology and microstructure on superhydrophobicity are discussed, and the internal relationship between Wenzel and Cassie states is presented. These two superhydrophobic states can coexist and they present different properties on contact angle hysteresis. It is reported that the irreversible transition can be realized from Cassie state to Wenzel state under some certain conditions. This paper also gives a review of recent progresses in the strategies of fabricating superhydrophobic surfaces by designing microstructured or microtextured surfaces. Finally, the fundamental research and applications of superhydrophobic surfaces are prospected.
Microorganism Response to Stressed Terrestrial Environments: A Raman Spectroscopic Perspective of Extremophilic Life Strategies  [PDF]
Susana E. Jorge-Villar,Howell G.M. Edwards
Life , 2013, DOI: 10.3390/life3010276
Abstract: Raman spectroscopy is a valuable analytical technique for the identification of biomolecules and minerals in natural samples, which involves little or minimal sample manipulation. In this paper, we evaluate the advantages and disadvantages of this technique applied to the study of extremophiles. Furthermore, we provide a review of the results published, up to the present point in time, of the bio- and geo-strategies adopted by different types of extremophile colonies of microorganisms. We also show the characteristic Raman signatures for the identification of pigments and minerals, which appear in those complex samples.
Microstructured continua and scaling for wave motion  [cached]
Jüri Engelbrecht
Atti della Accademia Peloritana dei Pericolanti : Classe di Scienze Fisiche, Matematiche e Naturali , 2013, DOI: 10.1478/aapp.91s1a8
Abstract: This paper deals with wave motion in microstructured solids. A short introduction explains how the basic mathematical models for description of microstructure(s) of solids are derived. Based on the Mindlin-type micromorphic theory, the governing equations for wave motion in such solids are presented in one-dimensional setting. The focus of the paper is in explaining the importance of internal scales in microstructured solids. It is shown that the proper scaling permits to construct the mathematical models which involve hierarchies of wave operators. Depending on the scale parameter (the ratio of an internal scale over the wave length), the various operators govern the wave propagation. The main case analysed here consists of the second-order operators but the first-order operators which are characteristic to evolution equations, are also briefly explained.
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