collision theory


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collision theory

[kə′lizh·ən ‚thē·ə·rē]
(physical chemistry)
Theory of chemical reaction proposing that the rate of product formation is equal to the number of reactant-molecule collisions multiplied by a factor that corrects for low-energy-level collisions.
(quantum mechanics)
Theory to describe collisions of simple or complex particles, the derivation of collision cross sections from postulated interactions and the study of properties of collision amplitudes which follow from invariance principles such as conservation of probability and time-reversal invariance.
References in periodicals archive ?
Over the past decades scientists have simulated this process and reproduced many of the properties of the Earth-Moon system; however, these simulations have also given rise to a problem known as the Lunar Paradox: the Moon appears to be made up of material that would not be expected if the current collision theory is correct.
* The method of determining conflict hazardous level (CHL) of different conflict types among mixed-traffic modes is proposed through the integration of the accident collision theory and HIC index for head hazard assessment.
The College Years is their second tour, a more advanced thesis on collision theory which has further cemented their position as leading academic experts in pop.
Andrews) therefore takes a progressive approach and proceeds step-by-step with examples, explaining basic and advanced transition state theory, basic and advanced unimolecular theory, potential energy surfaces, simple and modified collision theory, state-to-state kinetics in energy transfer and reaction, energy transfer and molecular beam studies of reactive scattering.
The discovery of 2003 EL61's family strongly supports the collision theory. That makes it "a milestone in Kuiper belt science and in our understanding of the outer solar system's development," says Alessandro Morbidelli of the Observatory of the Cote d'Azur in Nice, France.
The dynamics fundamental laws and the main principles of the plane collision theory are used to primary solve the equation system developed for the plane collision.
According to the collision theory, two simultaneous and completely separate neoplasms arise at the same time at the same site.
Bolstering the collision theory, a Royal Navy submarine had gone into Faslane for emergency repairs days later.
To add to the collision theory was the fact that a Royal Navy submarine had gone into Faslane for emergency repairs days after the sinking.
If the collision theory is correct, Uranus may have several more moons, but most would be too small and dim to detect, Kavelaars says.
The collision theory gained ground when the Navy submarine Vigilant went into Faslane for emergency repairs to its radar days after the disaster.

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