Pressure and Temperature Dependence of the Raman Peak Intensity Ratio of Asymmetric Stretching Vibration (ν3) and Asymmetric Bending Overtone (2ν2) of Methane

2014 ◽  
Vol 68 (5) ◽  
pp. 536-540 ◽  
Author(s):  
Menghan Wang ◽  
Wanjun Lu ◽  
Lanlan Li ◽  
Shaohua Qiao
Keyword(s):  
Temperature Dependence ◽  
Intensity Ratio ◽  
Raman Peak ◽  
Peak Intensity Ratio ◽  
Peak Intensity ◽  
Stretching Vibration ◽  
Asymmetric Bending ◽  
Raman Peak Intensity

The distribution of BrKα/RbKα peak intensity ratio in human whole blood samples

1994 ◽  
Vol 42 (3) ◽  
pp. 231-241 ◽  
Author(s):  
C. Shenberg ◽  
S. Spiegel ◽  
S. Chaitchik ◽  
P. Jordan ◽  
M. Kitzis ◽  
...  
Keyword(s):  
Whole Blood ◽  
Intensity Ratio ◽  
Peak Intensity Ratio ◽  
Blood Samples ◽  
Human Whole Blood ◽  
Peak Intensity ◽  
Whole Blood Samples

High sensitivity X-ray analysis for a low accelerating voltage scanning electron microscope using a transition edge sensor

Microscopy ◽  
2020 ◽  
Vol 69 (5) ◽  
pp. 298-303
Author(s):  
Keiichi Tanaka ◽  
Akira Takano ◽  
Atsushi Nagata ◽  
Satoshi Nakayama ◽  
Kaname Takahashi ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Intensity Ratio ◽  
Transition Edge Sensor ◽  
High Energy Resolution ◽  
Peak Intensity Ratio ◽  
X Ray ◽  
Peak Intensity ◽  
Transition Edge ◽  
Scanning Electron

Abstract A scanning electron microscope transition edge sensor has been developed to analyze the minor or trace constituents contained in a bulk sample and small particles on the sample under a low accelerating voltage (typically <3 keV). The low accelerating voltage enables to improve the spatial analysis resolution because the primary electron diffusion length is limited around the sample surface. The characteristic points of our transition edge sensor are 1) high-energy resolution at 7.2 eV@Al-Kα, 2) continuous operation by using a cryogen-free dilution refrigerator and 3) improvement of transmission efficiency at B-Kα by using thin X-ray film windows between the sample and detector (about 30 times better than our previous system). Our system could achieve a stabilization of the peak shift at Nd-Mα (978 eV) within 1 eV during an operation time of 27 000 s. The detection limits with B-Kα for detection times 600 and 27 000 s were 0.27 and 0.038 wt%, respectively. We investigated the peak separation ability by measuring the peak intensity ratio between the major constitute (silicon) and the minor constitute (tungsten) because the Si-Kα line differs from the W-Mα line by only 35 eV and a small W-Mα peak superimposed on the tail of the large Si-Kα peak. The peak intensity ratio (I(W-Mα)/I(Si-Kα)) was adjusted by the W particle area ratio compared with the Si substrate area. The transition edge sensor could clearly separate the Si-Kα and W-Mα lines even under a peak intensity ratio of 0.01.

Developing Micro-Raman Mass Spectrometry for Measuring Carbon Isotopic Composition of Carbon Dioxide

2007 ◽  
Vol 61 (7) ◽  
pp. 701-705 ◽  
Author(s):  
Masashi Arakawa ◽  
Junji Yamamoto ◽  
Hiroyuki Kagi
Keyword(s):  
Isotopic Composition ◽  
Intensity Ratio ◽  
High Spatial Resolution ◽  
Carbon Isotopic Composition ◽  
Peak Intensity Ratio ◽  
Factors Affecting ◽  
Isotopic Compositions ◽  
Carbon Isotopic ◽  
Peak Intensity ◽  
The Relationship

We investigated the applicability of micro-Raman spectroscopy for determining carbon isotopic compositions (13C/12C) of minute CO2 fluid inclusions in minerals. This method is nondestructive and has sufficiently high spatial resolution (1 μm) to measure each fluid inclusion independently. Raman spectra of CO2 fluid have 12CO2-origin peaks at about 1285 cm−1 and 1389 cm−1 (v12− and v12+) and a 13CO2-origin peak at about 1370 cm−1 (v13+). The relationship between carbon isotopic compositions and peak intensity ratios of v12+ and v13+ was calibrated. Considering several factors affecting the peak intensity ratio, the error in obtained carbon isotopic composition was 2% (20‰). The reproducibility of the intensity ratio under the same experimental environment was 0.5% (5‰). Within these error values, we can distinguish biogenic CO2 from abiogenic CO2.

scholarly journals Valley-to-peak intensity ratio thermometry based on the red upconversion emission of Er^3+

2016 ◽  
Vol 24 (12) ◽  
pp. 13244 ◽  
Author(s):  
Leipeng Li ◽  
Wei Xu ◽  
Longjiang Zheng ◽  
Feng Qin ◽  
Yuan Zhou ◽  
...  
Keyword(s):  
Intensity Ratio ◽  
Upconversion Emission ◽  
Peak Intensity Ratio ◽  
Peak Intensity

Study of surface defects and crystallinity of MWCNTs growth in FCCVD

2017 ◽  
Vol 24 (6) ◽  
pp. 845-851
Author(s):  
Shazia Shukrullah ◽  
Norani Muti Mohamed ◽  
Maizatul Shima Shaharun ◽  
Muhammad Yasin Naz
Keyword(s):  
Carbon Nanotubes ◽  
Surface Defects ◽  
Chemical Vapor ◽  
Raman Peak ◽  
Multiwalled Carbon ◽  
Peak Intensity ◽  
Black Spots ◽  
Pure Carbon ◽  
Structural Growth ◽  
Raman Peak Intensity

AbstractThis research investigated the structural growth of multiwalled carbon nanotubes (MWCNTs) in a double stage horizontal chemical vapor deposition (CVD) reactor. Ethylene was used as a carbon source for nucleation of nanotubes. Ferrocene catalyst weight was varied from 0.1 to 0.2 g to demonstrate the growth of MWCNTs on Si/SiO2/Al2O3 substrate. The obtained data revealed that the weight of the catalyst significantly affects the diameter, crystallinity, alignment and yield of the nanotubes. Lower inner-shell spacing and the ratio of D-Raman peak intensity and G-Raman peak intensity (ID/IG ratio) were obtained with 0.15 g of ferrocene, which was an indication of relatively pure carbon nanotubes (CNTs) growth. Raman spectra also confirmed the highly crystalline and relatively pure CNTs structures with ID/IG ratio of 0.700. TGA data revealed the formation of 97% pure nanotubes with oxidation temperature of 620°C. However, above and below the optimum (0.15 g of ferrocene), some of the grown CNTs were found defective and few black spots were also seen in TEM micrographs.

Antimicrobial Tendency of Bagasse Lignin Extracts by Raman Peak Intensity

Sugar Tech ◽  
2020 ◽  
Vol 22 (4) ◽  
pp. 697-705
Author(s):  
Jackapon Sunthornvarabhas ◽  
Prapassorn Rungthaworn ◽  
Udomlak Sukatta ◽  
Narissara Juntratip ◽  
Klanarong Sriroth
Keyword(s):  
Raman Peak ◽  
Peak Intensity ◽  
Raman Peak Intensity
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