α-Alums: K,Rb,Tl and NH4Al(SO4)2⋅ 12H2O – a new family of χ(3)-active crystalline materials for Raman laser converters with large frequency shifts

2004 ◽  
Vol 1 (4) ◽  
pp. 205-211 ◽  
Author(s):  
A A Kaminskii ◽  
E Haussühl ◽  
S Haussühl ◽  
H J Eichler ◽  
K Ueda ◽  
...  
Keyword(s):  
Raman Laser ◽  
Frequency Shifts ◽  
Crystalline Materials ◽  
New Family ◽  
Large Frequency

Large frequency shifts of absorption profiles due to the combination of optical pumping, light shift, and magnetic fields in sodium vapor

1994 ◽  
Vol 50 (3) ◽  
pp. 2434-2437 ◽  
Author(s):  
B. Röhricht ◽  
P. Eschle ◽  
C. Wigger ◽  
S. Dangel ◽  
R. Holzner ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Optical Pumping ◽  
Light Shift ◽  
Sodium Vapor ◽  
Frequency Shifts ◽  
Large Frequency

scholarly journals Temperature dependence of acoustic vibrations of CdSe and CdSe–CdS core–shell nanocrystals measured by low-frequency Raman spectroscopy

2016 ◽  
Vol 18 (41) ◽  
pp. 28797-28801 ◽  
Author(s):  
A. Jolene Mork ◽  
Elizabeth M. Y. Lee ◽  
William A. Tisdale
Keyword(s):  
Raman Spectroscopy ◽  
Low Temperature ◽  
Temperature Dependence ◽  
Low Frequency ◽  
Inhomogeneous Broadening ◽  
Core Shell ◽  
Acoustic Vibrations ◽  
Frequency Shifts ◽  
Higher Harmonic ◽  
Large Frequency

Low-temperature Raman spectroscopy reveals inhomogeneous broadening, surprisingly large frequency shifts, and the origin of higher harmonic peaks in core–shell nanocrystals.

Potassium and ammonium hydrogen phthalates KHC6H4(COO)2and (NH4)HC6H4(COO)2- new organic crystals for Raman laser converters with large frequency shift

2009 ◽  
Vol 6 (7) ◽  
pp. 544-551 ◽  
Author(s):  
A.A. Kaminskii ◽  
S.N. Bagayev ◽  
V.V. Dolbinina ◽  
E.A. Voloshin ◽  
H. Rhee ◽  
...  
Keyword(s):  
Frequency Shift ◽  
Raman Laser ◽  
Organic Crystals ◽  
Ammonium Hydrogen ◽  
Large Frequency

scholarly journals Multiferroic hexagonal ferrites (h-RFeO3, R = Y, Dy-Lu): a brief experimental review

2014 ◽  
Vol 28 (21) ◽  
pp. 1430008 ◽  
Author(s):  
Xiaoshan Xu ◽  
Wenbin Wang
Keyword(s):  
Rare Case ◽  
Room Temperature ◽  
Magnetoelectric Effect ◽  
Film Growth ◽  
Thin Film Growth ◽  
Hexagonal Ferrites ◽  
Intrinsic Properties ◽  
Crystalline Materials ◽  
New Family ◽  
Magnetoelectric Properties

Hexagonal ferrites ( h - RFeO 3, R = Y , Dy - Lu ) have recently been identified as a new family of multiferroic complex oxides. The coexisting spontaneous electric and magnetic polarizations make h - RFeO 3 rare-case ferroelectric ferromagnets at low temperature. Plus the room-temperature multiferroicity and the predicted magnetoelectric effect, h - RFeO 3 are promising materials for multiferroic applications. Here we review the structural, ferroelectric, magnetic and magnetoelectric properties of h - RFeO 3. The thin film growth is also discussed because it is critical in making high quality single crystalline materials for studying intrinsic properties.

scholarly journals Metal-Organic Framework Glasses with Permanent Accessible Porosity

2018 ◽  
Author(s):  
Chao Zhou ◽  
Louis Longley ◽  
Andraz Krajnc ◽  
Glen J. Smales ◽  
Ang Qiao ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Internal Surface ◽  
Vycor Glass ◽  
Crystalline Materials ◽  
Porous Glasses ◽  
Surface Areas ◽  
New Family ◽  
Metal Organic ◽  
Post Synthesis ◽  
Accessible Porosity

To date, only several microporous, and even fewer nanoporous, glasses have been produced, always via post synthesis acid treatment of phase separated dense materials, e.g. Vycor glass. In comparison, high internal surface areas are readily achieved in crystalline materials, such as metal-organic frameworks (MOFs). It has recently been discovered that a new family of melt quenched glasses can be produced from MOFs, though they have thus far have lacked the accessible and intrinsic porosity of their crystalline precursors. Here, we report the first glasses that are permanently, and reversibly porous toward incoming gases, without post synthetic treatment. We characterized the structure of these glasses using a range of experimental techniques, and demonstrate pores in the 4-8 angstrom range. The discovery of MOF-glasses with permanent accessible porosity reveals a new category of porous glass materials, that are potentially elevated beyond conventional inorganic and organic porous glasses, by their diversity and tunability.

scholarly journals Signature of solar g modes in first-order p-mode frequency shifts

2019 ◽  
Vol 629 ◽  
pp. A26 ◽  
Author(s):  
Vincent G. A. Böning ◽  
Huanchen Hu ◽  
Laurent Gizon
Keyword(s):  
Structural Changes ◽  
Mode Frequency ◽  
Frequency Separation ◽  
Frequency Shifts ◽  
First Order ◽  
Solar Structure ◽  
Central Regions ◽  
Open Question ◽  
Harmonic Degree ◽  
Large Frequency

Context. Solar gravity modes (g modes) are buoyancy waves that are trapped in the solar radiative zone and have been very difficult to detect at the surface. Solar g modes would complement solar pressure modes (p modes) in probing the central regions of the Sun, for example the rotation rate of the core. Aims. A detection of g modes using changes in the large frequency separation of p modes has recently been reported. However, it is unclear how p and g modes interact. The aim of this study is to evaluate to what extent g modes can perturb the frequencies of p modes. Methods. We computed the first-order perturbation to global p-mode frequencies due to a flow field and perturbations to solar structure (e.g. density and sound speed) caused by a g mode. We focused on long-period g modes and assumed that the g-mode perturbations are constant in time. The surface amplitude of g modes is assumed to be 1 mm s−1, which is close to the observational limit set by Doppler observations. Results. Gravity modes do perturb p-mode frequencies to first order if the harmonic degree of the g mode is even and if its azimuthal order is zero. The effect is extremely small. For dipole and quadrupole p modes, all frequency shifts are smaller than 0.1 nHz, or 2 × 10−8 in relative numbers. This is because the relative perturbation to solar structure quantities caused by a g mode of realistic amplitude is of the order of 10−6–10−5. Additionally, we find that structural changes dominate over advection. Surprisingly, the interaction of g and p modes takes place to a large part near the surface, where p modes spend most of their propagation times and g modes generate the largest relative changes to solar structure. This is due to the steep density stratification, which compensates the evanescent behaviour of g modes in the convection zone. Conclusions. It appears to be impossible to detect g modes solely through their signature in p-mode frequency shifts. Whether g modes leave a detectable signature in p-mode travel times under a given observational setup remains an open question.

scholarly journals Using Quartz Crystal Microbalance for Field Measurement of Liquid Viscosities

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Qingsong Bai ◽  
Xianhe Huang
Keyword(s):  
Field Measurement ◽  
Quartz Crystal ◽  
Newtonian Liquid ◽  
Viscous Damping ◽  
Frequency Shifts ◽  
Viscous Liquids ◽  
Sensor Applications ◽  
Potential Applications ◽  
Quartz Crystal Microbalances ◽  
Large Frequency

The field measurement of liquid viscosities, especially the high viscous liquids, is challenging and often requires expensive equipment, long processing time, and lots of reagent. We use quartz crystal microbalances (QCMs) operating in solution which are also sensitive to the viscosity and density of the contacting solution. QCMs are typically investigated for sensor applications in which one surface of QCM completely immersed in Newtonian liquid, but the viscous damping in liquids would cause not only large frequency shifts but also large losses in the quality factorQleading to instability and even cessation of oscillation. A novel mass-sensitivity-based method for field measurement of liquid viscosities using a QCM is demonstrated in this paper and a model describing the influence of the liquid properties on the oscillation frequency is established as well. Two groups of verified experiments were performed and the experimental results show that the presented method is effective and possesses potential applications.

scholarly journals Metal-Organic Framework Glasses with Permanent Accessible Porosity

2018 ◽  
Author(s):  
Chao Zhou ◽  
Louis Longley ◽  
Andraz Krajnc ◽  
Glen J. Smales ◽  
Ang Qiao ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Internal Surface ◽  
Vycor Glass ◽  
Crystalline Materials ◽  
Porous Glasses ◽  
Surface Areas ◽  
New Family ◽  
Metal Organic ◽  
Post Synthesis ◽  
Accessible Porosity

To date, only several microporous, and even fewer nanoporous, glasses have been produced, always via post synthesis acid treatment of phase separated dense materials, e.g. Vycor glass. In comparison, high internal surface areas are readily achieved in crystalline materials, such as metal-organic frameworks (MOFs). It has recently been discovered that a new family of melt quenched glasses can be produced from MOFs, though they have thus far have lacked the accessible and intrinsic porosity of their crystalline precursors. Here, we report the first glasses that are permanently, and reversibly porous toward incoming gases, without post synthetic treatment. We characterized the structure of these glasses using a range of experimental techniques, and demonstrate pores in the 4-8 angstrom range. The discovery of MOF-glasses with permanent accessible porosity reveals a new category of porous glass materials, that are potentially elevated beyond conventional inorganic and organic porous glasses, by their diversity and tunability.

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