Collisional effects inQbranch coherent anti‐Stokes Raman spectra of N2and O2at high pressure and high temperature

1994 ◽  
Vol 100 (9) ◽  
pp. 6275-6289 ◽  
Author(s):  
T. Dreier ◽  
G. Schiff ◽  
A. A. Suvernev
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Raman Spectra ◽  
Anti Stokes

A Study for N2 Coherent Anti-Stokes Raman Spectroscopy Thermometry at High Pressure

1983 ◽  
Vol 37 (6) ◽  
pp. 508-512 ◽  
Author(s):  
Haruhiko Kataoka ◽  
Shiro Maeda ◽  
Chiaki Hirose ◽  
Koichi Kajiyama
Keyword(s):  
Raman Spectroscopy ◽  
High Pressure ◽  
High Temperature ◽  
Pressure Range ◽  
High Pressures ◽  
Band Width ◽  
Maximum Height ◽  
Temperature Determination ◽  
Engine Cylinder ◽  
Anti Stokes

N2 coherent anti-Stokes Raman spectroscopy (CARS) thermometry over a pressure range 1 to 50 atm has been studied. The CARS profile at high pressure and high temperature was recorded by using the ignition inside a running engine cylinder. The observed Q-branch profile was theoretically fitted by incorporating the collisional narrowing effect, serving for the temperature determination at various pressures. Because of the narrowing effect, the apparent band width showed little change with pressure above 5 atm in general. It has been suggested that the band width at 1/5 of the maximum height can be a useful measure of temperature, while the usual half-width turns out to be hardly practicable at high pressures.

scholarly journals Raman spectra based pressure calibration of the non-gauge sapphire anvil cell at high temperature and high pressure

2015 ◽  
Vol 64 (14) ◽  
pp. 149101
Author(s):  
Jiang Jian-Jun ◽  
Li He-Ping ◽  
Dai Li-Dong ◽  
Hu Hai-Ying ◽  
Zhao Chao-Shuai
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Raman Spectra ◽  
Pressure Calibration

High-temperature high-pressure Raman spectra from liquid water

1988 ◽  
Vol 92 (15) ◽  
pp. 4540-4542 ◽  
Author(s):  
G. E. Walrafen ◽  
M. S. Hokmabadi ◽  
W. H. Yang ◽  
G. J. Piermarini
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Raman Spectra ◽  
Liquid Water ◽  
High Temperature High Pressure

scholarly journals Core growth of detonation nanodiamonds under high-pressure annealing

RSC Advances ◽  
2021 ◽  
Vol 11 (21) ◽  
pp. 12961-12970
Author(s):  
Denis Bogdanov ◽  
Alexander Bogdanov ◽  
Vladimir Plotnikov ◽  
Sergey Makarov ◽  
Alexander Yelisseyev ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Raman Spectra ◽  
Detonation Nanodiamonds ◽  
X Ray ◽  
High Pressure High Temperature ◽  
Different Temperatures

The present paper reports the results of a study of the X-ray and Raman spectra of detonation nanodiamonds after high-pressure high-temperature (HPHT) annealing at different temperatures.

High Pressure and High Temperature Induced Polymeric C60 Nanorods and Their Photoluminescence Properties

2006 ◽  
Vol 987 ◽  
Author(s):  
Bingbing Liu ◽  
Yuanyuan Hou ◽  
Lin Wang ◽  
Guangtian Zou ◽  
Agnieszka Iwasiewicz ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Hydrostatic Pressure ◽  
Raman Spectra ◽  
Potential Application ◽  
Near Infrared ◽  
Photoluminescence Intensity ◽  
Pressure Condition ◽  
Photoluminescence Properties ◽  
Enhanced Fluorescence

AbstractWe report that C60 nanorods of three polymeric phases have been synthesized under high pressure and high temperature and that the photoluminescence properties of these polymeric nanorods also have been studied. C60 nanorods were fabricated by a facile solution evaporation method. Raman spectra indicate that this material transformed into orthorhombic, tetragonal and rhombohedral polymeric phases under various high pressure and high temperature conditions. SEM measurements show that the shape of the nanorods can be kept under quasi-hydrostatic pressure condition. The photoluminescence intensity of the polymeric C60 nanorods has been enhanced compared with that of the pristine C60 nanorods. The main fluorescence band shifted from 1.70 eV in the monomeric phase to near infrared in the polymeric phase when pressure and temperature were increased. The enhanced fluorescence with adjustable frequency for different polymeric C60 nanorods makes possible potential application in luminescent nanomaterials.

Amorphization of Cristobalite at High Temperature in Vacuum

2005 ◽  
Vol 20 (8) ◽  
pp. 1943-1946 ◽  
Author(s):  
Chang-Ming Xu ◽  
S.W. Wang ◽  
X.X. Huang ◽  
J.K. Guo
Keyword(s):  
Shock Wave ◽  
High Pressure ◽  
High Temperature ◽  
Ambient Temperature ◽  
Raman Spectra ◽  
Infrared Spectra ◽  
Interstitial Oxygen ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diamond Anvil

Amorphous transition behavior of silica polymorphs under high pressure has been extensively studied by using diamond-anvil cells or shock wave technologies at ambient temperature. Here, we report the amorphization of crystalline silica fiber in cristobalite polymorph in the temperature range of 1050–1350 °C without pressure applied in vacuum. X-ray diffraction, infrared spectra, and Raman spectra illustrated the transition. Raman spectra revealed that no significant changes had happened to the SiO4 unit during the transition. It is suggested that the driven-off of interstitial oxygen attributed to the transition and the reaction between the diffusing hydrogen and interstitial oxygen promoted the process.

scholarly journals Size Effects on Surface Chemistry and Raman Spectra of Sub-5 nm Oxidized High-Pressure High-Temperature and Detonation Nanodiamonds

2021 ◽  
Vol 125 (10) ◽  
pp. 5647-5669
Author(s):  
Stepan Stehlik ◽  
Michel Mermoux ◽  
Bernhard Schummer ◽  
Ondrej Vanek ◽  
Katerina Kolarova ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Surface Chemistry ◽  
Raman Spectra ◽  
Size Effects ◽  
Detonation Nanodiamonds ◽  
High Pressure High Temperature
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