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The concept of triple collisions cross-section in termolecular recombination reaction was investigated.
The change in the collision cross-section, in turn, can be measured as a change in the transport properties.
The area of an ion that gas molecules strike is an ion's collision cross-section, related to the ion size and shape.
A reduced pressure is where the applied pressure gas is at a few torr, commonly used to measure ion collision cross-sections.
Two empirical functions widely used for summarizing experimental rate data were inverted through an inverse Laplace transform to give the triple collision cross-section.
Some Electron Collision Cross-Sections for Nitrogen and Oxygen, Proc.
Electron Collision Cross-Sections in Helium, Proc.
Nott: "Fluorescence Decay of Aromatic Vapours, III.Single Vibronic Lifetimes and Collision Cross-Sections for Pyrimidine", Australian Journal of Chemistry, 31, 1875-87.
The resulting rotation of the molecule averages out the nonspherical part of the collision cross-section, if the field is large enough that the precession time is short compared to the time between collisions (this requires a very dilute gas).
In this way correction factors for the area of the collision cross-section, the collision frequency, the average doublet life time, and the steady-state doublet concentrations of separating (or transient) doublets have been calculated as a function of ρm.
The greater this collision cross-section is, meaning the larger the ion size, the more area available for buffer gas to collide and impede the ion's drift - the ion then requires a longer time to migrate through the drift tube.
For example, related experiments which measure elastic collision cross-sections of ultracold caesium atoms point to the feasibility of using evaporative cooling of magnetically trapped caesium to reach the temperatures required for the observation of the much-sought Bose-Einstein condensation of atoms.