scholarly journals Proposed Thermodynamic Pressure Scale for an Absolute High‐Pressure Calibration

1970 ◽  
Vol 41 (2) ◽  
pp. 833-835 ◽  
Author(s):  
D. L. Decker ◽  
J. D. Barnett
Keyword(s):  
High Pressure ◽  
Pressure Calibration ◽  
Pressure Scale ◽  
Thermodynamic Pressure

XII.—On the Theory of Unimolecular Gas Reactions: A Quantum Harmonic Oscillator Model

1954 ◽  
Vol 64 (2) ◽  
pp. 161-174 ◽  
Author(s):  
N. B. Slater
Keyword(s):  
High Pressure ◽  
Classical Mechanics ◽  
Classical Case ◽  
Constant Factor ◽  
Quantum Case ◽  
Fundamental Vibration ◽  
Fixed Temperature ◽  
Dissociation Probability ◽  
Pressure Scale ◽  
Continuum Of States

SynopsisThe writer's theory of unimolecular dissociation rates, based on the treatment of the molecule as a harmonically vibrating system, is put in a form which covers quantum as well as classical mechanics. The classical rate formulæ are as before, and are also the high-temperature limits of the new quantum formulæ. The high-pressure first-order rate k∞ is found first from the Gaussian distribution of co-ordinates and momenta of harmonic systems, and is justified for the quantum-mechanical case by Bartlett and Moyal's phase-space distributions. This leads to a re-formulation of k∞ as a molecular dissociation probability averaged over a continuum of states, and to a general rate for any pressure of the gas.The high-pressure rate k∞ is of the form ve-F/kT, where v and F depend, in the quantum case, on the temperature T; but v is always between the highest and lowest fundamental vibration frequencies of the molecule. Concerning the decline of the general rate k with pressure at fixed temperature, k/k∞ is to a certain approximation the same function of as was tabulated earlier for the classical case, apart from a constant factor changing the pressure scale in the quantum case.

Construction of the new gas meter high pressure calibration facility – Technical and metrological problems

2018 ◽  
Vol 60 ◽  
pp. 57-66 ◽  
Author(s):  
Mateusz Turkowski ◽  
Eliza Dyakowska ◽  
Paweł Szufleński ◽  
Tomasz Jakubiak
Keyword(s):  
High Pressure ◽  
Pressure Calibration ◽  
Calibration Facility

Spectroscopy at High Pressures—Status Report and Update of Instrumental Techniques

1974 ◽  
Vol 28 (6) ◽  
pp. 505-516 ◽  
Author(s):  
John R. Ferraro ◽  
Louis J. Basile
Keyword(s):  
Raman Spectroscopy ◽  
High Pressure ◽  
High Pressures ◽  
Status Report ◽  
Future Outlook ◽  
Optical Link ◽  
Interferometric Technique ◽  
Pressure Calibration ◽  
Calibration Methods ◽  
Optical Pressure

A status report and update of the instrumentation necessary to obtain spectra of molecules at high pressures are presented. The optical pressure cells used, the spectrophotometer needed to obtain the spectra, the optical link between the two, high pressure spectroscopic windows, pressure calibration methods, and future outlook of the technique will be determined. The use of the high pressure cells with the interferometric technique and for Raman spectroscopy is outlined.

Correction to the High-Pressure Scale

Nature ◽  
1962 ◽  
Vol 196 (4850) ◽  
pp. 159-160 ◽  
Author(s):  
ALFRED BOBROWSKY
Keyword(s):  
High Pressure ◽  
Pressure Scale

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

scholarly journals Fundamental High-Pressure Calibration from All-Electron Quantum Monte Carlo Calculations

2010 ◽  
Vol 104 (18) ◽  
Author(s):  
K. P. Esler ◽  
R. E. Cohen ◽  
B. Militzer ◽  
Jeongnim Kim ◽  
R. J. Needs ◽  
...  
Keyword(s):  
High Pressure ◽  
Monte Carlo ◽  
Quantum Monte Carlo ◽  
Monte Carlo Calculations ◽  
Pressure Calibration ◽  
Electron Quantum
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