scholarly journals Vibrational Energy Distribution in BaI Produced in Reactions of Van der Waals Molecules

1986 ◽  
Vol 5 (6) ◽  
pp. 385-392 ◽  
Author(s):  
R. Naaman
Keyword(s):  
Energy Distribution ◽  
Vibrational Energy ◽  
Van Der Waals ◽  
Laser Induced Fluorescence ◽  
The Other ◽  
Kcal Mole ◽  
Van Der Waals Molecules ◽  
Other Hand ◽  
Vibrational Distribution ◽  
Vibrational Energy Distribution

The reactions of Ba with CF3I dimers and CH3IAr complexes were studied applying the laser induced fluorescence (LIF) technique. It was found that the BaI produced from the dimers contains about 20 kcal/mole less vibrational energy than the BaI produced in the corresponding monomeric reaction. The CH3IAr on the other hand, yielded only a slightly colder vibrational distribution than the monomers.

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.

scholarly journals Laser-Induced Fluorescence Study on Reactions of C+(2P) and C(1D,1S) With Alcohols Leading to CH(X2Π) Radicals at Thermal Energy

1987 ◽  
Vol 7 (5-6) ◽  
pp. 333-341 ◽  
Author(s):  
Masaharu Tsuji ◽  
Ichiro Nagano ◽  
Nobuaki Nishiyama ◽  
Hiroshi Sekiya ◽  
Yukio Nishimura
Keyword(s):  
Thermal Energy ◽  
Laser Induced Fluorescence ◽  
The Other ◽  
Isotopic Substitution ◽  
Fluorescence Study ◽  
Flowing Afterglow ◽  
Hydride Ion ◽  
Other Hand ◽  
Vibrational Distribution

Thermal energy reactions of C+(2P) and C(1D,1S) with CH3OH, C2H5OH, n-C3H7OH and i-C3H7OH to give CH(X2Π) radicals have been investigated by observing laser-induced fluorescence (LIF) spectra of CH(A—X) in a flowing afterglow. In the hydride ion abstraction by C+(2P), only CH3OH exhibited the CH(A—X) LIF spectrum with a vibrational distribution of 1.0 : 0.62 for v″ = 0 and 1, respectively. On the other hand, the CH(A—X) LIF spectra exclusively from v″ = 0 were observed in the reactions of C(1D,1S) with all alcohols studied. By isotopic substitution for CH3OH it was shown that the CH(X) radicals arise from the selective attack on the methyl site in the reactions of C+(2P) and C(1D,1S) with methanol.

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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