1
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2
and 4, leaving all the others unchanged; this fact can account for
[
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the quantitative discrepancies between numerical simulations and
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tative deviations from experiments [27].
(
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4
[
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. Concluding remarks
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The results presented in this Letter underline the role of the
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[
[
malonic acid oxidation by ceric ions, in the production of bromi-
nated species which, in turn, determine the length of the induction
period. The relevance of this reaction for the IP, was also pointed
out in the past by numerical simulations [13], which showed that
the kinetic constant k can be the only adjustable parameter to fix
3
some of the deviation of the GTF and MBM models with respect to
the experimental data.
By exploiting the deuterium isotope effect, we were able to
modify the reaction kinetics, thus influencing the oscillating
parameters, without altering the basic BZ mechanisms. Therefore,
it was possible to simulate our results with the MBM model. Final-
ly, we showed how the effective dependence of the IP length on the
reaction pathways (a) and (b) can be inferred by using kinetic con-
stants relative to reactions (4), (E1) and (E2) in numerical
simulations.
13] A. Cadena, N. Perez, J.S. Agreda, D. Barragan, J. Braz. Chem. Soc. 16 (2) (2005)
14.
2
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8377.
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[
[
[
[18] S. Barkin, M. Bixon, R.M. Noyes, K. Bar-eli, Int. J. Chem. Kinet. 10 (6) (1978) 619.
[
[
[
[
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Am. Chem. Soc. 117 (23) (1995) 6372.
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(1997) 2743.
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(
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Acknowledgements
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63.
9
[
27] L. Hegedus, M. Wittmann, Z. Noszticzius, S.H. Yan, A. Sirimungkala, H.D.
Forsterling, R.J. Field, Faraday Discuss. 120 (2001) 21.
Thanks are due to Sandra Ristori (University of Florence) for
helping us to improve the quality of our manuscript. We are in
debt with anonymous referees which drove our attention to some
references and corrected many of our mistakes.
[28] L. Hegedus, H. Forsterling, L. Onel, M. Wittmann, Z. Noszticzius, J. Phys. Chem.
[
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