Additions and Corrections
4124 The Journal of Physical Chemistry, Vol. 96, No. 11, 1992
which scavenges part of the reducing radicals.
Acknowledgment. We thank Dr. Eberhard Janata for advice in the pulse radiolysis experiments and Dr. Paul Mulvaney for valuable discussions.
Registry NO. Pd(NH,)&12, 13815-17-3; PdCN, 140875-92-9; CN-, 57-12-5; CO, 630-08-0; Pd?', 140875-97-4;Pd(CN)d2-, 1500487-2; Hz, 1333-74-0; HS,7783-06-4; N ~7727-37-9; , ~ ~10024-97.2; 0 , 02,778244-7; H202.7722-84-1; Pd, 7440-05-3; PdS, 12648-43-0; poly(ethy1eneimine), 9002-98-6; methyl viologen, 1910-42-5.
ADDITIONS AND CORRECTIONS 1990, Volume 94
R. J. Beuhler, Y. Y. Chu, C. Friedlander, L. Friedman,* and W. Kunnmann: Deuteron-Deuteron Fusion by Impact of HeavyWater Clusters on Deuterated Surfaces. Page 7665. Detection of D-D fusion events when accelerated heavy-water cluster ions impact on deuterated targets' immediately raised questions about the possibility that traces of high-velocity beam contaminants (artifacts) could account for the experimental results. Experimental searches for sufficient fluxes of trace contaminants produced what appeared to be negative result^.*^^ These results led us to conclude that energy ampliation processes during and after cluster impact were responsible for the observed fusion events. Further searches for direct experimental evidence for artifact contributions have now convinced us that this conclusion is in error. The new results indicate that the cluster impact fusion rates reported in recent publi~ationsI-~ were overestimated by at least 2 orders of magnitude. Recent experiments using magnetic deflection of accelerated ion beams coupled with electrostatic deflection of these beams provide experimental evidence that artifacts are primarily responsible for events that have been ascribed to cluster impact fusion. When ions with mass less than 25 Da were magnetically deflected out of the beam, the fusion event rate was reduced by at least 2 orders of magnitude, whereas electrostatic energy analysis of the beam exiting the magnet showed transmission of roughly 50% of the cluster ion beam. Details of these experiments will be presented in a future publication. We still have no quantitative model for the formation of artifacts, and further experiments are in progress to study this problem. Experiments are also in progress with magnetically filtered beams to determine either values or upper limits of cluster impact fusion rates. Y. K. Bae, who joined us after our original and his independent confirmation of these results4 were published, made substantial contributions to the experiments reported here.
1991. Volume 95 J. A. Seetula, D.Cutman,* P. D. Lightfoot,* M. T. Rayez, and S. M. senkan: Kinetics of the Reactions of Partially Halogenated Methyl Radicals (CHzC1, CH,Br, CHJ, and CHClZ)with Molecular Chlorine. Page 10688. One of the authors' names was spelled incorrectly. The correct spelling is M. T. Rayez.
