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activation_energy
has definitions from the field of physics
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[ noun ] (physics) the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur
Synonyms Examples "catalysts are said to reduce the energy of activation during the transition phase of a reaction" Used in print (Francis J. Johnston and John E. Willard, "The...)It appears possible to set a lower_limit of about * * f for the activation_energy of the abstraction of a chlorine atom from a carbon_tetrachloride molecule by a chlorine atom to form * * f radical . It would appear that it should be possible to determine unique mechanisms for the thermal and photochemical_reactions in both the liquid and gas phases and to determine values for activation_energies of some of the intermediate reactions of atoms and free_radicals , as_well_as information on the heat_of_dissociation of the carbon halogen bond . Furthermore , the exchange would not be expected to be sensitive to trace amounts of impurities because it would not be apt to be a chain_reaction since the activation_energy for abstraction of chlorine by a chlorine atom would be expected to be too high ; also it would be expected that * * f would compete very effectively with any impurities as a scavenger for * * f radicals . We are reporting these investigations here briefly because of their relevancy to problems of the study of apparently simple exchange reactions of chlorine and because the results furnish some information on the activation_energy for abstraction of chlorine atoms from carbon_tetrachloride . Some 80 reaction tubes from 13 manifold fillings were illuminated in the temperature range from 40 to 85 ` in a further endeavor to determine the cause of the irreproducibility and to obtain information on the activation_energy and the effect of light intensity . Related terms |
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