Accuracy
Transition state theory requires a value of the transmission coefficient as a prefactor in the Eyring equation above. This value is usually taken to be unity (i.e., the transition state always proceeds to products and never reverts back to reactants and ). As discussed by Winzor and Jackson in 2006, this assumption invalidates the description of an equilibrium between the transition state and the reactants and therefore the empirical Arrhenius equation is preferred with a phenomenological interpretation of the prefactor and activation energy . For more details, see discussion in Winzor and Jackson (2006) pages 399-400 in section "Transition-state theory."
To avoid specifying a value of the ratios of rate constants can be compared to the value of a rate constant at some fixed reference temperature (i.e., ) which eliminates the term in the resulting expression.
Read more about this topic: Eyring Equation
Famous quotes containing the word accuracy:
“U.S. international and security policy ... has as its primary goal the preservation of what we might call “the Fifth Freedom,” understood crudely but with a fair degree of accuracy as the freedom to rob, to exploit and to dominate, to undertake any course of action to ensure that existing privilege is protected and advanced.”
—Noam Chomsky (b. 1928)
“In everything from athletic ability to popularity to looks, brains, and clothes, children rank themselves against others. At this age [7 and 8], children can tell you with amazing accuracy who has the coolest clothes, who tells the biggest lies, who is the best reader, who runs the fastest, and who is the most popular boy in the third grade.”
—Stanley I. Greenspan (20th century)
“Such is the never-failing beauty and accuracy of language, the most perfect art in the world; the chisel of a thousand years retouches it.”
—Henry David Thoreau (1817–1862)