Evaluation of residual pressure in an inclusion-host system using negative frequency shift of quartz Raman spectra

2014 ◽  
Vol 99 (2-3) ◽  
pp. 433-442 ◽  
Author(s):  
Y. Kouketsu ◽  
T. Nishiyama ◽  
T. Ikeda ◽  
M. Enami
Keyword(s):  
Frequency Shift ◽  
Raman Spectra ◽  
Residual Pressure ◽  
Host System ◽  
Negative Frequency Shift

Raman spectra of tetragonal zirconia: powder to zircaloy oxide frequency shift

2001 ◽  
Vol 288 (2-3) ◽  
pp. 241-247 ◽  
Author(s):  
Pierre Barbéris ◽  
Gaëlle Corolleur-Thomas ◽  
René Guinebretière ◽  
Thérèse Merle-Mejean ◽  
Andrei Mirgorodsky ◽  
...  
Keyword(s):  
Frequency Shift ◽  
Raman Spectra ◽  
Tetragonal Zirconia ◽  
Zirconia Powder

Darstellung und Schwingungsspektren von Alkyl-und Rhodanohydrohexaboraten / Preparation and Vibrational Spectra of Alkyl and Rhodano Hydrohexaborates

1988 ◽  
Vol 43 (10) ◽  
pp. 1327-1331 ◽  
Author(s):  
A Heinrich ◽  
W Preetz
Keyword(s):  
Frequency Shift ◽  
Raman Spectra ◽  
Organic Solvents ◽  
Vibrational Spectra ◽  
High Frequency ◽  
Acidity Constants ◽  
High Frequency Shift ◽  
Basic Solutions ◽  
Stretching Vibrations ◽  
Ir And Raman

Treatment of B6H62- with iodoalkanes and (SCN)2 in organic solvents affords the monosubstituted protonated hexaborates RB6H6-, R = CH3, C2H5< C3H7, C4H9, C8H17 and SCN, respectively. The acidity constants of these weak Brönsted acids range for the alkylated species from 8.8 to 9.6, and for R = SCN the pka value is ~5. From basic solutions the salts Cs2RB6H5 can be precipitated, which show band patterns in the IR and Raman spectra typical for monosubstituted hydrohexaborates. The protonated compounds RB6H6- are distinguished from the corresponding Brönsted bases RB6H52- by a high frequency shift of the BH stretching vibrations in the order of 100 cm-1. For Cs2(SCN)B6H5, S coordination of SCN- is supposed because of the high frequency of νCN: 2144 cm-1.

Etude de Cavités Electromagnétiques Perturbées par un Diélectrique : Application aux Masers

1971 ◽  
Vol 49 (11) ◽  
pp. 1482-1492 ◽  
Author(s):  
M. Tessier ◽  
J. Vanier
Keyword(s):  
Frequency Shift ◽  
Quality Factor ◽  
Method Of Moments ◽  
Filling Factor ◽  
The Other ◽  
Microwave Cavities ◽  
Negative Frequency Shift ◽  
Theoretical Results

In certain types of masers it is common to use storage quartz bulbs in microwave cavities. We describe the effects of such bulbs on the field components, the frequency, the quality factor, and the filling factor. Two different methods are used to solve the problem: one of these methods is classical and exact and is based on the continuity of the field components and on the equations of separation; the other method used is the so called "method of moments". The two methods give essentially the same results. Experiments have been performed to verify the theoretical results. We have observed that the quartz storage bulb produces a slight negative frequency shift, a notable lowering of the quality factor and a very slight change in the filling factor; the perturbed mode appears as a superposition of other modes. It is concluded that to reduce the perturbation we must use extremely thin bulbs with walls very close to the cavity walls.

Raman Scattering Spectroscopy of GeSi/Si Strained Layer Superlattice

1993 ◽  
Vol 298 ◽  
Author(s):  
Zhang Rong ◽  
Zheng Youdou ◽  
Gu Shulin ◽  
Hu Liqun
Keyword(s):  
Raman Scattering ◽  
Frequency Shift ◽  
Raman Spectra ◽  
Strain Distribution ◽  
Phonon Frequency ◽  
New Method ◽  
Raman Scattering Spectroscopy ◽  
Scattering Measurements ◽  
Optic Phonon ◽  
Strained Layer Superlattice

AbstractRaman scattering measurements have been carried out on Si1-xGex/Si SLS. It is found that the Ge–Ge optic phonon frequency shift is proportional to strain in the SiGe film, and the Ge–Ge strain shift coefficient is 408cm−1. Based on these study a new method for analyzing the Raman spectra of SiGe/Si SLS has been proposed. Using the new method we can obtain the composition of the alloy sublayers as well as the strain in SLS. The strain distribution in the SiGe/Si SLS has been discussed, and strain in both SiGe and Si sublayers of the SLS have been calculated.

scholarly journals Комбинационное рассеяние света в эвтектическом композите InSb-MnSb

2020 ◽  
Vol 54 (4) ◽  
pp. 341
Author(s):  
И.Х. Мамедов ◽  
Д.Г. Араслы ◽  
Р.Н. Рагимов ◽  
А.А. Халилова
Keyword(s):  
Thin Films ◽  
Frequency Shift ◽  
Raman Spectra ◽  
High Frequency ◽  
Theoretical Data ◽  
Eutectic Composite ◽  
Flash Evaporation ◽  
Evaporation Method ◽  
The Matrix ◽  
High Frequency Shift

Raman spectra of bulk samples of the InSb-MnSb eutectic composite and their thin films prepared by the flash evaporation method have been studied. In the Raman spectra observed TO and LO modes at frequencies of 179.5 cm-1 and 192.4 cm-1 correspond to InSb compound and also the peaks at frequencies 122 cm-1, 127 cm-1, 167 cm-1, 211 cm-1, 245.5 cm-1 correspond to theoretical data for MnSb as is well known from literature. The TO mode in the Raman spectra for films is shifted toward lower energies (178 cm-1), but the LO mode is higher (196 cm-1). The high-frequency shift of the LO mode in the composite with compared its value for InSb is probably due to the presence of deformation at the matrix-inclusion interface, as well as the contribution by surface phonons scattering.

scholarly journals Interpretation of Quartz Crystal Microbalance Behavior with Viscous Film Using a Mason Equivalent Circuit

Chemosensors ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 9
Author(s):  
Sawit Na Songkhla ◽  
Takamichi Nakamoto
Keyword(s):  
Frequency Shift ◽  
Equivalent Circuit ◽  
Quartz Crystal ◽  
Single Layer ◽  
Frequency Change ◽  
Sensing Applications ◽  
Sensitivity And Selectivity ◽  
Quartz Crystal Microbalances ◽  
Negative Frequency Shift ◽  
Positive Frequency

In odor sensing based on Quartz Crystal Microbalances (QCMs), the sensing film is crucial for both sensor sensitivity and selectivity. The typical response of the QCM due to sorption is a negative frequency shift. However, in some cases, the sorption causes a positive frequency shift, and then, Sauerbrey’s equation and Kanazawa’s equation cannot be applied to this situation. We model the QCM response with a Mason equivalent circuit. The model approximates a single layer of a uniform viscous coating on the QCM. The simulation of the equation circuit shows the possibility of the positive frequency change when the sorption occurs, which is the situation we find in some of the odor sensing applications. We measured the QCM frequency and resistance using the Vector Network Analyzer (VNWA). The QCMs were coated with glycerol, PEG2000, and PEG20M. To simulate odor exposure, a microdispenser was used to deposit the water. A positive frequency shift was observed in the case of PEG2000, and a negative frequency change was obtained for PEG20M. These results can be explained by the Mason equivalent circuit, with the assumption that when the film is exposed to water, its thickness increases and its viscosity decreases.

scholarly journals Establishing a protocol for the selection of zircon inclusions in garnet for Raman thermobarometry

2020 ◽  
Vol 105 (7) ◽  
pp. 992-1001
Author(s):  
Nicola Campomenosi ◽  
Daniela Rubatto ◽  
Joerg Hermann ◽  
Boriana Mihailova ◽  
Marco Scambelluri ◽  
...  
Keyword(s):  
Raman Spectra ◽  
Inductively Coupled Plasma ◽  
Structural Heterogeneity ◽  
Peak Position ◽  
Major Influence ◽  
Chemical Information ◽  
Residual Pressure ◽  
Peak Width ◽  
Contrast Imaging ◽  
Selection Of

Abstract The structural and chemical properties of zircon inclusions in garnet megablasts from the Dora Maira Massif (Western Alps, Italy) were characterized in detail using charge contrast imaging, Raman spectroscopy, and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). The aim of this work is to determine to what extent the degree of metamictization, metamorphic recrystallization, inherent structural heterogeneity, chemical composition, and zoning, along with the elastic stress imposed by the host mineral, can influence the Raman peak position of the zircon inclusion and hence, the residual pressure estimated via Raman geo-thermobarometry. We show and confirm that metamictization and inherent structural heterogeneity have a major influence in the Raman spectra of zircon in terms of peak position and peak width. We suggest that, for spectral resolution of 2 cm−1, the peak width of the B1g mode near 1008 cm−1 of reliable grains must be smaller than 5 cm−1. The method can be applied to both inherited igneous and newly formed Alpine metamorphic crystals. By coupling structural and chemical information, we demonstrate that there are no significant differences between the Raman spectra of zircon with oscillatory-zoned texture, formed during magmatic crystallization, and those formed by fluid-induced Alpine (re)crystallization. The discrimination between magmatic and metamorphic zircon based only on micro-textural constraints is not robust. Finally, our results allow establishing a protocol devoted to the selection of reliable buried zircon inclusions, relying only on Raman spectroscopic measurements, to use for elastic thermobarometry applications.

scholarly journals Lines of Large Frequency Shift in the Raman Spectra of Crystals

Nature ◽  
1931 ◽  
Vol 128 (3229) ◽  
pp. 495-495 ◽  
Author(s):  
R. TOMASCHEK
Keyword(s):  
Frequency Shift ◽  
Raman Spectra ◽  
Large Frequency

(111) Monocrystalline Nickel Films

1972 ◽  
Vol 30 ◽  
pp. 512-513
Author(s):  
T.E. Pratt ◽  
R.W. Vook
Keyword(s):  
Film Thickness ◽  
Deposition Rate ◽  
Room Temperature ◽  
Narrow Range ◽  
High Vacuum ◽  
Residual Pressure ◽  
Temperature Dependent ◽  
Deposition Parameters ◽  
Transmission Electron ◽  
Substrate Temperatures

(111) oriented thin monocrystalline Ni films have been prepared by vacuum evaporation and examined by transmission electron microscopy and electron diffraction. In high vacuum, at room temperature, a layer of NaCl was first evaporated onto a freshly air-cleaved muscovite substrate clamped to a copper block with attached heater and thermocouple. Then, at various substrate temperatures, with other parameters held within a narrow range, Ni was evaporated from a tungsten filament. It had been shown previously that similar procedures would yield monocrystalline films of CU, Ag, and Au.For the films examined with respect to temperature dependent effects, typical deposition parameters were: Ni film thickness, 500-800 A; Ni deposition rate, 10 A/sec.; residual pressure, 10-6 torr; NaCl film thickness, 250 A; and NaCl deposition rate, 10 A/sec. Some additional evaporations involved higher deposition rates and lower film thicknesses.Monocrystalline films were obtained with substrate temperatures above 500° C. Below 450° C, the films were polycrystalline with a strong (111) preferred orientation.

Single Crystal Raman Spectra of the Phase Transition in KTCNQ

1982 ◽  
Vol 85 (1) ◽  
pp. 297-303 ◽  
Author(s):  
A. D. Bandrauk ◽  
K. D. Truong ◽  
S. Jandl
Keyword(s):  
Phase Transition ◽  
Single Crystal ◽  
Raman Spectra
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