Calibration of Sm:YAG as an alternate high‐pressure scale

1990 ◽  
Vol 68 (10) ◽  
pp. 5357-5359 ◽  
Author(s):  
Q. Bi ◽  
J. M. Brown ◽  
Y. Sato‐Sorensen
Keyword(s):  
High Pressure ◽  
Pressure Scale

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.

Correction to the High-Pressure Scale

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

Diamond and cubic boron nitride under high pressure: Raman scattering, equation of state and high pressure scale

1989 ◽  
Vol 1 (5-6) ◽  
pp. 333-336 ◽  
Author(s):  
I. V. Aleksandrov ◽  
A. P. Goncharov ◽  
I. N. Makarenko ◽  
A. N. Zisman ◽  
E. V. Jakovenko ◽  
...  
Keyword(s):  
High Pressure ◽  
Equation Of State ◽  
Boron Nitride ◽  
Raman Scattering ◽  
Cubic Boron Nitride ◽  
Pressure Scale

Pressure dependence of Sm:YAG fluorescence to 50 GPa: A new calibration as a high pressure scale

1994 ◽  
Vol 75 (3) ◽  
pp. 1463-1466 ◽  
Author(s):  
Hitoshi Yusa ◽  
Takehiko Yagi ◽  
Haruo Arashi
Keyword(s):  
High Pressure ◽  
Pressure Dependence ◽  
Pressure Scale

High-Pressure Physics: The 1-Megabar Mark on the Ruby R1 Static Pressure Scale

Science ◽  
1976 ◽  
Vol 191 (4229) ◽  
pp. 851-852 ◽  
Author(s):  
H. K. MAO ◽  
P. M. BELL
Keyword(s):  
High Pressure ◽  
Static Pressure ◽  
Pressure Scale
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