| 单词 | activation barrier |
| 释义 | > as lemmasactivation barrier Chemistry. In full activation barrier. The amount by which the energy of the transition state of a reaction exceeds that of the initial state; the energy that must be supplied to the reactants for a given reaction to begin; cf. activation energy n. at activation n. Compounds. ΚΠ 1932 Chem. Rev. 10 121 Most of the problems of compound formation (valence) and activation energy may be solved by constructing a potential energy surface the low planes of which correspond to compounds stable at ordinary temperatures, provided the barrier separating one minimum from a still lower one is greater than about 20 kg-cal. 1981 P. Sykes Guidebk. to Mechanism in Org. Chem. (ed. 5) ii. 38 The height of the barrier..is called the free energy of activation for the reaction (the higher it is the slower the reaction). 2006 J. M. Hornback Org. Chem. (Internat. Student ed.) viii. 270 It has an activation barrier, although small, that must be surmounted for reaction in either the forward or reverse direction. < as lemmas |
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