Raman probing of overtone and combination bands to study the vibrational energy distribution produced by multiple-photon excitation

1986 ◽  
Vol 124 (4) ◽  
pp. 304-308 ◽  
Author(s):  
Yu.S. Doljikov ◽  
V.S. Letokhov ◽  
A.A. Makarov ◽  
A.L. Malinovsky ◽  
E.A. Ryabov
Keyword(s):  
Energy Distribution ◽  
Vibrational Energy ◽  
Photon Excitation ◽  
Combination Bands ◽  
Vibrational Energy Distribution

scholarly journals Inter- and Intramolecular Vibrational Distribution in IR Multiple Photon Excitation: CF2Cl2 Molecule

1988 ◽  
Vol 8 (2-4) ◽  
pp. 81-96 ◽  
Author(s):  
Yu. S. Doljikov ◽  
A. L. Malinovsky ◽  
E. A. Ryabov
Keyword(s):  
Energy Distribution ◽  
Vibrational Energy ◽  
Vibrational Motion ◽  
Cold Molecules ◽  
Vibrational Distribution ◽  
Photon Excitation ◽  
Vibrational Energy Distribution

Vibrational energy distribution of IR MP-excited CF2Cl2 is studied when pumping molecules through ν1 and ν8 modes. In both cases the intermolecular distribution is found to be in a state of nonequilibrium consisting of ensembles of “hot” and “cold” molecules. The structure of the “cold” ensemble is different when ν1 and ν8 modes are pumped. Statistical intramolecular energy distribution caused by stochastization of vibrational motion is found for “hot” molecules. The estimated value of stochastization onset energy equals Eth ≤ 7800 cm−1.

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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