Rotational Energy Dispersions for Van Der Waals Molecular Clusters

1993 ◽  
pp. 137-143 ◽  
Author(s):  
Lawrence L. Lohr ◽  
Carl H. Huben
Keyword(s):  
Van Der Waals ◽  
Molecular Clusters ◽  
Rotational Energy

The observation of double molecules in gases

1966 ◽  
Vol 291 (1426) ◽  
pp. 389-412 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Mass Spectra ◽  
Van Der Waals ◽  
Rotational Energy ◽  
Polyatomic Molecules ◽  
Condensation Process ◽  
Measured Concentration ◽  
Expected Values ◽  
Three Body ◽  
Theoretical Assessment

It has previously been shown that when a gas is adiabatically expanded, association of the molecules occurs as a first step in the condensation process. It is now shown that double molecules exist in the gas even before expansion. These double molecules have been observed in the mass spectra of carbon dioxide, nitrous oxide, nitrogen, oxygen, argon and xenon, and some gas mixtures. They are believed to exist in all gases at temperatures where the attractive van der Waals interaction is important, and where the pressure is sufficiently high to produce a significant fraction of three-body collisions. Evidence is presented that the observed molecules are not the products of reactions in the mass spectrometer. For argon and xenon the concentrations of these species, and their variation with temperature over the range 180 to 300 °K, agree reasonably well with the theoretically expected values. For polyatomic molecules the measured concentration is much less than predicted. This is believed to be associated with an instability of the double molecules, the transfer of rotational energy from the constituent molecules breaking the van der Waals bond. A theoretical assessment of this effect is attempted for carbon dioxide and nitrogen, and gives approximate agreement with experiment.

CALCULATION OF THE INTERACTION POTENTIAL FOR BICHROMOPHORIC HETERO-MOLECULAR CLUSTERS

1996 ◽  
Vol 05 (04) ◽  
pp. 695-721 ◽  
Author(s):  
GERSHON ROSENBLUM ◽  
SHAMMAI SPEISER
Keyword(s):  
Interaction Potential ◽  
Van Der Waals ◽  
Molecular Clusters ◽  
Van Der Waals Interaction ◽  
Alternative Methods ◽  
Molecular Polarizability ◽  
Molecular Cluster

An expression for the interaction potential between two anisotropic molecules is derived. This expression is suitable for describing the van der Waals interaction between two chromophores within a bichromophoric molecular cluster. For the anthracene-naphthalene and for the benzene-biacetyl clusters the calculation predicts the existence of two isomers, in agreement with experimental observations. The model is also successfully applied to other clusters yielding better results than those obtained by alternative methods which do not take into account the anisotropy of molecular polarizability.

Van der Waals Complexes and Small Molecular Clusters: A Tool to Understand and Control Chemical Reactions

1998 ◽  
pp. 53-95
Author(s):  
Claude Dedonder-Lardeux ◽  
Christophe Jouvet ◽  
Séverine Martrenchard-Barra ◽  
Daneil Solgadi
Keyword(s):  
Chemical Reactions ◽  
Van Der Waals ◽  
Molecular Clusters ◽  
Van Der Waals Complexes ◽  
Control Chemical ◽  
And Control

Vibrational-rotational energy transfer in H 2 -H 2 collisions: III. Ortho-ortho collisions

2000 ◽  
Vol 98 (21) ◽  
pp. 1691-1695 ◽  
Author(s):  
Vladimir A. Zenevich, Gert D. Billing, Georg
Keyword(s):  
Energy Transfer ◽  
Rotational Energy ◽  
Rotational Energy Transfer

Infrared diode laser jet spectroscopy of the van der Waals complex (N2O)2

1997 ◽  
Vol 91 (4) ◽  
pp. 689-696 ◽  
Author(s):  
HAI-BO QIAN ◽  
WOUTER HERREBOUT ◽  
BRIAN HOWARD
Keyword(s):  
Diode Laser ◽  
Van Der Waals ◽  
Van Der Waals Complex
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