Evolution of the CO Vibrational Energy Distribution in a Transverse Flow Laser

1973 ◽  
Vol 51 (9) ◽  
pp. 1026-1029 ◽  
Author(s):  
P. H. Dawson
Keyword(s):  
Experimental Data ◽  
Energy Distribution ◽  
Population Inversion ◽  
Energy Exchange ◽  
Vibrational Energy ◽  
Transverse Flow ◽  
Vibrational Energy Distribution ◽  
Range Force ◽  
Comparison With Experimental Data

Values of the probabilities of vibrational energy exchange among CO molecules are calculated using the long-range force theory and provide the basis for a computer simulation of CO vibrational energy distribution in a transverse flow chemical laser. A comparison with experimental data demonstrates the importance of the very rapid redistribution of energy among high-lying levels due to CO†–CO† interactions and of the role of the chemical by-product OCS in enhancing the population inversion in levels ν = 6 to 10.

Vibrational Energy Transfer in Carbon Monoxide

1972 ◽  
Vol 50 (9) ◽  
pp. 889-897 ◽  
Author(s):  
P. H. Dawson ◽  
W. G. Tam
Keyword(s):  
Energy Exchange ◽  
Vibrational Energy ◽  
Transverse Flow ◽  
Vibration Energy ◽  
Excess Oxygen ◽  
Experimental Measurements ◽  
Energy Distributions ◽  
Vibrationally Excited ◽  
Population Distributions

The role of V–V processes in vibrationally excited CO systems in the longitudinal and transverse flow chemical lasers is studied. Initial vibrational energy distributions of CO formed by the O + CS reaction are deduced from chemiluminescent data using calculated values of the vibration energy exchange probabilities. The time evolution of the population distributions is then obtained by computer simulation. The results are compared with experimental measurements. The effects of excess oxygen and of "cold" CO on the population distributions are also discussed.

Vibrational energy distribution in plate excited with random white noise

2021 ◽  
Vol 263 (6) ◽  
pp. 965-969
Author(s):  
Tyrode Victor ◽  
Nicolas Totaro ◽  
Laurent Maxit ◽  
Alain Le Bot
Keyword(s):  
Boundary Conditions ◽  
Energy Distribution ◽  
White Noise ◽  
Numerical Simulations ◽  
Ray Tracing ◽  
Energy Analysis ◽  
Vibrational Energy ◽  
Statistical Energy Analysis ◽  
Vibrational Energy Distribution ◽  
Tracing Method

In Statistical Energy Analysis (SEA) and more generally in all statistical theories of sound and vibration, the establishment of diffuse field in subsystems is one of the most important assumption. Diffuse field is a special state of vibration for which the vibrational energy is homogeneously and isotropically distributed. For subsystems excited with a random white noise, the vibration tends to become diffuse when the number of modes is large and the damping sufficiently light. However even under these conditions, the so-called coherent backscattering enhancement (CBE) observed for certain symmetric subsystems may impede diffusivity. In this study, CBE is observed numerically and experimentally for various geometries of subsystem. Also, it is shown that asymmetric boundary conditions leads to reduce or even vanish the CBE. Theoretical and numerical simulations with the ray tracing method are provided to support the discussion.

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